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/core/approval-voting/src/tests.rs

@@ -3154,7 +3154,7 @@ where
 // starting configuration. The relevant ticks (all scheduled wakeups) are printed after no further
 // ticks are scheduled. To create a valid test, a prefix of the relevant ticks should be included
 // in the final test configuration, ending at the tick with the desired inputs to
-// should_trigger_assignemnt.
+// should_trigger_assignment.
 async fn step_until_done(clock: &MockClock) {
 	let mut relevant_ticks = Vec::new();
 	loop {
@@ -3837,7 +3837,7 @@ fn test_approval_is_sent_on_max_approval_coalesce_count() {
 
 async fn handle_approval_on_max_coalesce_count(
 	virtual_overseer: &mut VirtualOverseer,
-	candidate_indicies: Vec<CandidateIndex>,
+	candidate_indices: Vec<CandidateIndex>,
 ) {
 	assert_matches!(
 		overseer_recv(virtual_overseer).await,
@@ -3845,16 +3845,16 @@ async fn handle_approval_on_max_coalesce_count(
 			_,
 			c_indices,
 		)) => {
-			assert_eq!(TryInto::<CandidateBitfield>::try_into(candidate_indicies.clone()).unwrap(), c_indices);
+			assert_eq!(TryInto::<CandidateBitfield>::try_into(candidate_indices.clone()).unwrap(), c_indices);
 		}
 	);
 
-	for _ in &candidate_indicies {
+	for _ in &candidate_indices {
 		recover_available_data(virtual_overseer).await;
 		fetch_validation_code(virtual_overseer).await;
 	}
 
-	for _ in &candidate_indicies {
+	for _ in &candidate_indices {
 		assert_matches!(
 			overseer_recv(virtual_overseer).await,
 			AllMessages::CandidateValidation(CandidateValidationMessage::ValidateFromExhaustive{exec_kind, response_sender, ..}) if exec_kind == PvfExecKind::Approval => {
@@ -3885,7 +3885,7 @@ async fn handle_approval_on_max_coalesce_count(
 	assert_matches!(
 		overseer_recv(virtual_overseer).await,
 		AllMessages::ApprovalDistribution(ApprovalDistributionMessage::DistributeApproval(vote)) => {
-			assert_eq!(TryInto::<CandidateBitfield>::try_into(candidate_indicies).unwrap(), vote.candidate_indices);
+			assert_eq!(TryInto::<CandidateBitfield>::try_into(candidate_indices).unwrap(), vote.candidate_indices);
 		}
 	);
 
@@ -3895,7 +3895,7 @@ async fn handle_approval_on_max_coalesce_count(
 
 async fn handle_approval_on_max_wait_time(
 	virtual_overseer: &mut VirtualOverseer,
-	candidate_indicies: Vec<CandidateIndex>,
+	candidate_indices: Vec<CandidateIndex>,
 	clock: Box<MockClock>,
 ) {
 	const TICK_NOW_BEGIN: u64 = 1;
@@ -3909,16 +3909,16 @@ async fn handle_approval_on_max_wait_time(
 			_,
 			c_indices,
 		)) => {
-			assert_eq!(TryInto::<CandidateBitfield>::try_into(candidate_indicies.clone()).unwrap(), c_indices);
+			assert_eq!(TryInto::<CandidateBitfield>::try_into(candidate_indices.clone()).unwrap(), c_indices);
 		}
 	);
 
-	for _ in &candidate_indicies {
+	for _ in &candidate_indices {
 		recover_available_data(virtual_overseer).await;
 		fetch_validation_code(virtual_overseer).await;
 	}
 
-	for _ in &candidate_indicies {
+	for _ in &candidate_indices {
 		assert_matches!(
 			overseer_recv(virtual_overseer).await,
 			AllMessages::CandidateValidation(CandidateValidationMessage::ValidateFromExhaustive{exec_kind, response_sender, ..}) if exec_kind == PvfExecKind::Approval => {
@@ -3978,7 +3978,7 @@ async fn handle_approval_on_max_wait_time(
 	assert_matches!(
 		overseer_recv(virtual_overseer).await,
 		AllMessages::ApprovalDistribution(ApprovalDistributionMessage::DistributeApproval(vote)) => {
-			assert_eq!(TryInto::<CandidateBitfield>::try_into(candidate_indicies).unwrap(), vote.candidate_indices);
+			assert_eq!(TryInto::<CandidateBitfield>::try_into(candidate_indices).unwrap(), vote.candidate_indices);
 		}
 	);
 
@@ -4319,7 +4319,7 @@ fn subsystem_relaunches_approval_work_on_restart() {
 		virtual_overseer
 	});
 
-	// Restart a new approval voting subsystem with the same database and major syncing true untill
+	// Restart a new approval voting subsystem with the same database and major syncing true until
 	// the last leaf.
 	let config = HarnessConfigBuilder::default().backend(store_clone).major_syncing(true).build();