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/state-db/src/lib.rs

@@ -872,7 +872,7 @@ mod tests {
 	fn check_stored_and_requested_mode_compatibility(
 		mode_when_created: Option<PruningMode>,
 		mode_when_reopened: Option<PruningMode>,
-		expected_effective_mode_when_reopenned: Result<PruningMode, ()>,
+		expected_effective_mode_when_reopened: Result<PruningMode, ()>,
 	) {
 		let mut db = make_db(&[]);
 		let (state_db_init, state_db) =
@@ -883,7 +883,7 @@ mod tests {
 
 		let state_db_reopen_result =
 			StateDb::<H256, H256, TestDb>::open(db.clone(), mode_when_reopened, false, false);
-		if let Ok(expected_mode) = expected_effective_mode_when_reopenned {
+		if let Ok(expected_mode) = expected_effective_mode_when_reopened {
 			let (state_db_init, state_db_reopened) = state_db_reopen_result.unwrap();
 			db.commit(&state_db_init);
 			assert_eq!(state_db_reopened.pruning_mode(), expected_mode,)

substrate/client/state-db/src/noncanonical.rs

@@ -46,26 +46,26 @@ pub struct NonCanonicalOverlay<BlockHash: Hash, Key: Hash> {
 #[cfg_attr(test, derive(PartialEq, Debug))]
 struct OverlayLevel<BlockHash: Hash, Key: Hash> {
 	blocks: Vec<BlockOverlay<BlockHash, Key>>,
-	used_indicies: u64, // Bitmask of available journal indicies.
+	used_indices: u64, // Bitmask of available journal indices.
 }
 
 impl<BlockHash: Hash, Key: Hash> OverlayLevel<BlockHash, Key> {
 	fn push(&mut self, overlay: BlockOverlay<BlockHash, Key>) {
-		self.used_indicies |= 1 << overlay.journal_index;
+		self.used_indices |= 1 << overlay.journal_index;
 		self.blocks.push(overlay)
 	}
 
 	fn available_index(&self) -> u64 {
-		self.used_indicies.trailing_ones() as u64
+		self.used_indices.trailing_ones() as u64
 	}
 
 	fn remove(&mut self, index: usize) -> BlockOverlay<BlockHash, Key> {
-		self.used_indicies &= !(1 << self.blocks[index].journal_index);
+		self.used_indices &= !(1 << self.blocks[index].journal_index);
 		self.blocks.remove(index)
 	}
 
 	fn new() -> OverlayLevel<BlockHash, Key> {
-		OverlayLevel { blocks: Vec::new(), used_indicies: 0 }
+		OverlayLevel { blocks: Vec::new(), used_indices: 0 }
 	}
 }