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/network/dispute-distribution/src/sender/mod.rs

@@ -76,7 +76,7 @@ pub struct DisputeSender<M> {
 	/// Value is the hash that was used for the query.
 	active_sessions: HashMap<SessionIndex, Hash>,
 
-	/// All ongoing dispute sendings this subsystem is aware of.
+	/// All ongoing dispute sending this subsystem is aware of.
 	///
 	/// Using an `IndexMap` so items can be iterated in the order of insertion.
 	disputes: IndexMap<CandidateHash, SendTask<M>>,
@@ -105,7 +105,7 @@ struct WaitForActiveDisputesState {
 
 #[overseer::contextbounds(DisputeDistribution, prefix = self::overseer)]
 impl<M: 'static + Send + Sync> DisputeSender<M> {
-	/// Create a new `DisputeSender` which can be used to start dispute sendings.
+	/// Create a new `DisputeSender` which can be used to start dispute sending.
 	pub fn new(tx: NestingSender<M, DisputeSenderMessage>, metrics: Metrics) -> Self {
 		Self {
 			active_heads: Vec::new(),
@@ -362,7 +362,7 @@ async fn get_active_session_indices<Context>(
 	runtime: &mut RuntimeInfo,
 	active_heads: &Vec<Hash>,
 ) -> Result<HashMap<SessionIndex, Hash>> {
-	let mut indeces = HashMap::new();
+	let mut indices = HashMap::new();
 	// Iterate all heads we track as active and fetch the child' session indices.
 	for head in active_heads {
 		let session_index = runtime.get_session_index_for_child(ctx.sender(), *head).await?;
@@ -372,9 +372,9 @@ async fn get_active_session_indices<Context>(
 		{
 			gum::debug!(target: LOG_TARGET, ?err, ?session_index, "Can't cache SessionInfo");
 		}
-		indeces.insert(session_index, *head);
+		indices.insert(session_index, *head);
 	}
-	Ok(indeces)
+	Ok(indices)
 }
 
 /// Retrieve Set of active disputes from the dispute coordinator.

polkadot/node/network/dispute-distribution/src/tests/mock.rs

@@ -163,7 +163,7 @@ pub fn make_dispute_message(
 	let invalid_vote =
 		make_explicit_signed(MOCK_VALIDATORS[invalid_validator.0 as usize], candidate_hash, false);
 	gum::trace!(
-		"Passed time for invald vote: {:#?}",
+		"Passed time for invalid vote: {:#?}",
 		Instant::now().saturating_duration_since(before_request)
 	);
 	DisputeMessage::from_signed_statements(