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/utils/frame/benchmarking-cli/src/pallet/command.rs

@@ -415,7 +415,7 @@ impl PalletCmd {
 					.map_err(|e| {
 						format!("Error executing and verifying runtime benchmark: {}", e)
 					})?;
-					// Dont use these results since verification code will add overhead.
+					// Don't use these results since verification code will add overhead.
 					let _batch =
 						<std::result::Result<Vec<BenchmarkBatch>, String> as Decode>::decode(
 							&mut &result[..],
@@ -437,7 +437,7 @@ impl PalletCmd {
 							&pallet.clone(),
 							&extrinsic.clone(),
 							&selected_components.clone(),
-							false, // dont run verification code for final values
+							false, // don't run verification code for final values
 							self.repeat,
 						)
 							.encode(),
@@ -469,7 +469,7 @@ impl PalletCmd {
 							&pallet.clone(),
 							&extrinsic.clone(),
 							&selected_components.clone(),
-							false, // dont run verification code for final values
+							false, // don't run verification code for final values
 							self.repeat,
 						)
 							.encode(),

substrate/utils/frame/generate-bags/src/lib.rs

@@ -183,7 +183,7 @@ pub fn generate_thresholds<T: pallet_staking::Config>(
 	total_issuance: u128,
 	minimum_balance: u128,
 ) -> Result<(), std::io::Error> {
-	// ensure the file is accessable
+	// ensure the file is accessible
 	if let Some(parent) = output.parent() {
 		if !parent.exists() {
 			std::fs::create_dir_all(parent)?;

substrate/utils/frame/remote-externalities/src/lib.rs

@@ -762,7 +762,7 @@ where
 		let mut sp = Spinner::with_timer(Spinners::Dots, "Inserting keys into DB...".into());
 		let start = Instant::now();
 		pending_ext.batch_insert(key_values.clone().into_iter().filter_map(|(k, v)| {
-			// Don't insert the child keys here, they need to be inserted seperately with all their
+			// Don't insert the child keys here, they need to be inserted separately with all their
 			// data in the load_child_remote function.
 			match is_default_child_storage_key(&k.0) {
 				true => None,

substrate/utils/frame/rpc/state-trie-migration-rpc/src/lib.rs

@@ -132,7 +132,7 @@ pub trait StateMigrationApi<BlockHash> {
 	/// Check current migration state.
 	///
 	/// This call is performed locally without submitting any transactions. Thus executing this
-	/// won't change any state. Nonetheless it is a VERY costy call that should be
+	/// won't change any state. Nonetheless it is a VERY costly call that should be
 	/// only exposed to trusted peers.
 	#[method(name = "state_trieMigrationStatus")]
 	fn call(&self, at: Option<BlockHash>) -> RpcResult<MigrationStatusResult>;