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.~~

polkadot/node/service/src/overseer.rs

@@ -77,7 +77,7 @@ pub struct OverseerGenArgs<'a, Spawner, RuntimeClient>
 where
 	Spawner: 'static + SpawnNamed + Clone + Unpin,
 {
-	/// Runtime client generic, providing the `ProvieRuntimeApi` trait besides others.
+	/// Runtime client generic, providing the `ProvideRuntimeApi` trait besides others.
 	pub runtime_client: Arc<RuntimeClient>,
 	/// Underlying network service implementation.
 	pub network_service: Arc<sc_network::NetworkService<Block, Hash>>,

polkadot/node/service/src/parachains_db/upgrade.rs

@@ -115,7 +115,7 @@ pub(crate) fn try_upgrade_db_to_next_version(
 			Some(CURRENT_VERSION) => CURRENT_VERSION,
 			// This is an arbitrary future version, we don't handle it.
 			Some(v) => return Err(Error::FutureVersion { current: CURRENT_VERSION, got: v }),
-			// No version file. For `RocksDB` we dont need to do anything.
+			// No version file. For `RocksDB` we don't need to do anything.
 			None if db_kind == DatabaseKind::RocksDB => CURRENT_VERSION,
 			// No version file. `ParityDB` did not previously have a version defined.
 			// We handle this as a `0 -> 1` migration.
@@ -183,7 +183,7 @@ fn migrate_from_version_1_to_2(path: &Path, db_kind: DatabaseKind) -> Result<Ver
 	})
 }
 
-// Migrade approval voting database.
+// Migrate approval voting database.
 // In 4  `OurAssignment` has been changed to support the v2 assignments.
 // In 5, `BlockEntry` has been changed to store the number of delayed approvals.
 // As these are backwards compatible, we'll convert the old entries in the new format.

polkadot/node/service/src/relay_chain_selection.rs

@@ -472,7 +472,7 @@ where
 		let lag = initial_leaf_number.saturating_sub(subchain_number);
 		self.metrics.note_approval_checking_finality_lag(lag);
 
-		// Messages sent to `approval-distrbution` are known to have high `ToF`, we need to spawn a
+		// Messages sent to `approval-distribution` are known to have high `ToF`, we need to spawn a
 		// task for sending the message to not block here and delay finality.
 		if let Some(spawn_handle) = &self.spawn_handle {
 			let mut overseer_handle = self.overseer.clone();
@@ -524,7 +524,7 @@ where
 			// and not push it up the stack to cause additional issues in GRANDPA/BABE.
 			let (lag, subchain_head) =
 				match rx.await.map_err(Error::DetermineUndisputedChainCanceled) {
-					// If request succeded we will receive (block number, block hash).
+					// If request succeeded we will receive (block number, block hash).
 					Ok((subchain_number, subchain_head)) => {
 						// The total lag accounting for disputes.
 						let lag_disputes = initial_leaf_number.saturating_sub(subchain_number);