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/subsystem-bench/src/lib/approval/test_message.rs

@@ -31,7 +31,7 @@ pub struct TestMessageInfo {
 	pub msg: protocol_v3::ApprovalDistributionMessage,
 	/// The list of peers that would sends this message in a real topology.
 	/// It includes both the peers that would send the message because of the topology
-	/// or because of randomly chosing so.
+	/// or because of randomly choosing so.
 	pub sent_by: Vec<ValidatorIndex>,
 	/// The tranche at which this message should be sent.
 	pub tranche: u32,
@@ -90,7 +90,7 @@ impl MessagesBundle {
 
 	/// Tells if the bundle is needed for sending.
 	/// We either send it because we need more assignments and approvals to approve the candidates
-	/// or because we configured the test to send messages untill a given tranche.
+	/// or because we configured the test to send messages until a given tranche.
 	pub fn should_send(
 		&self,
 		candidates_test_data: &HashMap<(Hash, CandidateIndex), CandidateTestData>,
@@ -174,24 +174,24 @@ impl TestMessageInfo {
 		}
 	}
 
-	/// Returns a list of candidates indicies in this message
+	/// Returns a list of candidates indices in this message
 	pub fn candidate_indices(&self) -> HashSet<usize> {
-		let mut unique_candidate_indicies = HashSet::new();
+		let mut unique_candidate_indices = HashSet::new();
 		match &self.msg {
 			protocol_v3::ApprovalDistributionMessage::Assignments(assignments) =>
 				for (_assignment, candidate_indices) in assignments {
 					for candidate_index in candidate_indices.iter_ones() {
-						unique_candidate_indicies.insert(candidate_index);
+						unique_candidate_indices.insert(candidate_index);
 					}
 				},
 			protocol_v3::ApprovalDistributionMessage::Approvals(approvals) =>
 				for approval in approvals {
 					for candidate_index in approval.candidate_indices.iter_ones() {
-						unique_candidate_indicies.insert(candidate_index);
+						unique_candidate_indices.insert(candidate_index);
 					}
 				},
 		}
-		unique_candidate_indicies
+		unique_candidate_indices
 	}
 
 	/// Marks this message as no-shows if the number of configured no-shows is above the registered