Fix spelling mistakes across the whole repository (#3808)

**Update:** Pushed additional changes based on the review comments.

**This pull request fixes various spelling mistakes in this
repository.**

Most of the changes are contained in the first **3** commits:

- `Fix spelling mistakes in comments and docs`

- `Fix spelling mistakes in test names`

- `Fix spelling mistakes in error messages, panic messages, logs and
tracing`

Other source code spelling mistakes are separated into individual
commits for easier reviewing:

- `Fix the spelling of 'authority'`

- `Fix the spelling of 'REASONABLE_HEADERS_IN_JUSTIFICATION_ANCESTRY'`

- `Fix the spelling of 'prev_enqueud_messages'`

- `Fix the spelling of 'endpoint'`

- `Fix the spelling of 'children'`

- `Fix the spelling of 'PenpalSiblingSovereignAccount'`

- `Fix the spelling of 'PenpalSudoAccount'`

- `Fix the spelling of 'insufficient'`

- `Fix the spelling of 'PalletXcmExtrinsicsBenchmark'`

- `Fix the spelling of 'subtracted'`

- `Fix the spelling of 'CandidatePendingAvailability'`

- `Fix the spelling of 'exclusive'`

- `Fix the spelling of 'until'`

- `Fix the spelling of 'discriminator'`

- `Fix the spelling of 'nonexistent'`

- `Fix the spelling of 'subsystem'`

- `Fix the spelling of 'indices'`

- `Fix the spelling of 'committed'`

- `Fix the spelling of 'topology'`

- `Fix the spelling of 'response'`

- `Fix the spelling of 'beneficiary'`

- `Fix the spelling of 'formatted'`

- `Fix the spelling of 'UNKNOWN_PROOF_REQUEST'`

- `Fix the spelling of 'succeeded'`

- `Fix the spelling of 'reopened'`

- `Fix the spelling of 'proposer'`

- `Fix the spelling of 'InstantiationNonce'`

- `Fix the spelling of 'depositor'`

- `Fix the spelling of 'expiration'`

- `Fix the spelling of 'phantom'`

- `Fix the spelling of 'AggregatedKeyValue'`

- `Fix the spelling of 'randomness'`

- `Fix the spelling of 'defendant'`

- `Fix the spelling of 'AquaticMammal'`

- `Fix the spelling of 'transactions'`

- `Fix the spelling of 'PassingTracingSubscriber'`

- `Fix the spelling of 'TxSignaturePayload'`

- `Fix the spelling of 'versioning'`

- `Fix the spelling of 'descendant'`

- `Fix the spelling of 'overridden'`

- `Fix the spelling of 'network'`

Let me know if this structure is adequate.

**Note:** The usage of the words `Merkle`, `Merkelize`, `Merklization`,
`Merkelization`, `Merkleization`, is somewhat inconsistent but I left it
as it is.

~~**Note:** In some places the term `Receival` is used to refer to
message reception, IMO `Reception` is the correct word here, but I left
it as it is.~~

~~**Note:** In some places the term `Overlayed` is used instead of the
more acceptable version `Overlaid` but I also left it as it is.~~

~~**Note:** In some places the term `Applyable` is used instead of the
correct version `Applicable` but I also left it as it is.~~

**Note:** Some usage of British vs American english e.g. `judgement` vs
`judgment`, `initialise` vs `initialize`, `optimise` vs `optimize` etc.
are both present in different places, but I suppose that's
understandable given the number of contributors.

~~**Note:** There is a spelling mistake in `.github/CODEOWNERS` but it
triggers errors in CI when I make changes to it, so I left it as it
is.~~

substrate/client/consensus/grandpa/src/communication/mod.rs

@@ -222,13 +222,13 @@ pub(crate) struct NetworkBridge<B: BlockT, N: Network<B>, S: Syncing<B>> {
 	neighbor_sender: periodic::NeighborPacketSender<B>,
 
 	/// `NeighborPacketWorker` processing packets sent through the `NeighborPacketSender`.
-	// `NetworkBridge` is required to be cloneable, thus one needs to be able to clone its
+	// `NetworkBridge` is required to be clonable, thus one needs to be able to clone its
 	// children, thus one has to wrap `neighbor_packet_worker` with an `Arc` `Mutex`.
 	neighbor_packet_worker: Arc<Mutex<periodic::NeighborPacketWorker<B>>>,
 
 	/// Receiver side of the peer report stream populated by the gossip validator, forwarded to the
 	/// gossip engine.
-	// `NetworkBridge` is required to be cloneable, thus one needs to be able to clone its
+	// `NetworkBridge` is required to be clonable, thus one needs to be able to clone its
 	// children, thus one has to wrap gossip_validator_report_stream with an `Arc` `Mutex`. Given
 	// that it is just an `UnboundedReceiver`, one could also switch to a
 	// multi-producer-*multi*-consumer channel implementation.
@@ -766,7 +766,7 @@ impl<Block: BlockT> Sink<Message<Block::Header>> for OutgoingMessages<Block> {
 			)
 			.ok_or_else(|| {
 				Error::Signing(format!(
-					"Failed to sign GRANDPA vote for round {} targetting {:?}",
+					"Failed to sign GRANDPA vote for round {} targeting {:?}",
 					self.round, target_hash
 				))
 			})?;

substrate/client/consensus/grandpa/src/communication/periodic.rs

@@ -106,7 +106,7 @@ impl<B: BlockT> Stream for NeighborPacketWorker<B> {
 
 		// Make sure the underlying task is scheduled for wake-up.
 		//
-		// Note: In case poll_unpin is called after the resetted delay fires again, this
+		// Note: In case poll_unpin is called after the reset delay fires again, this
 		// will drop one tick. Deemed as very unlikely and also not critical.
 		while this.delay.poll_unpin(cx).is_ready() {}
 

substrate/client/consensus/grandpa/src/tests.rs

@@ -1805,7 +1805,7 @@ async fn grandpa_environment_checks_if_best_block_is_descendent_of_finality_targ
 	);
 
 	// best block is higher than finality target and it's on the same fork,
-	// the best block passed to the voting rule should not be overriden
+	// the best block passed to the voting rule should not be overridden
 	select_chain.set_best_chain(client.expect_header(hashof10_a).unwrap());
 	select_chain.set_finality_target(client.expect_header(hashof5_a).unwrap().hash());
 	voting_rule.set_expected_best_block(hashof10_a);
@@ -1940,7 +1940,7 @@ async fn justification_with_equivocation() {
 			precommits.push(precommit);
 		}
 
-		// we create an equivocation for the 67th validator targetting blocks #1 and #2.
+		// we create an equivocation for the 67th validator targeting blocks #1 and #2.
 		// this should be accounted as "voting for all blocks" and therefore block #3 will
 		// have 67/100 votes, reaching finality threshold.
 		{

substrate/client/consensus/grandpa/src/until_imported.rs

@@ -1002,7 +1002,7 @@ mod tests {
 	}
 
 	#[test]
-	fn block_global_message_wait_completed_return_none_on_block_number_missmatch() {
+	fn block_global_message_wait_completed_return_none_on_block_number_mismatch() {
 		let msg_inner = test_catch_up();
 
 		let waiting_block_1 =

substrate/client/consensus/grandpa/src/voting_rule.rs

@@ -196,7 +196,7 @@ where
 		target_header = backend
 			.header(target_hash)
 			.ok()?
-			.expect("Header known to exist due to the existence of one of its descendents; qed");
+			.expect("Header known to exist due to the existence of one of its descendants; qed");
 	}
 }
 

substrate/client/consensus/grandpa/src/warp_proof.rs

@@ -249,7 +249,7 @@ impl<Block: BlockT, Backend: ClientBackend<Block>> NetworkProvider<Block, Backen
 where
 	NumberFor<Block>: BlockNumberOps,
 {
-	/// Create a new istance for a given backend and authority set.
+	/// Create a new instance for a given backend and authority set.
 	pub fn new(
 		backend: Arc<Backend>,
 		authority_set: SharedAuthoritySet<Block::Hash, NumberFor<Block>>,