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/network/sync/src/strategy/chain_sync/test.rs

@@ -189,7 +189,7 @@ fn restart_doesnt_affect_peers_downloading_finality_data() {
 	assert_eq!(sync.peers.get(&peer_id3).unwrap().common_number, 50);
 }
 
-/// Send a block annoucnement for the given `header`.
+/// Send a block announcement for the given `header`.
 fn send_block_announce(header: Header, peer_id: PeerId, sync: &mut ChainSync<Block, TestClient>) {
 	let announce = BlockAnnounce {
 		header: header.clone(),
@@ -278,7 +278,7 @@ fn unwrap_from_block_number(from: FromBlock<Hash, u64>) -> u64 {
 /// announcement from this node in its sync process. Meaning our common number didn't change. It
 /// is now expected that we start an ancestor search to find the common number.
 #[test]
-fn do_ancestor_search_when_common_block_to_best_qeued_gap_is_to_big() {
+fn do_ancestor_search_when_common_block_to_best_queued_gap_is_to_big() {
 	sp_tracing::try_init_simple();
 
 	let blocks = {
@@ -472,7 +472,7 @@ fn can_sync_huge_fork() {
 		let actions = sync.take_actions().collect::<Vec<_>>();
 
 		request = if actions.is_empty() {
-			// We found the ancenstor
+			// We found the ancestor
 			break
 		} else {
 			assert_eq!(actions.len(), 1);
@@ -607,7 +607,7 @@ fn syncs_fork_without_duplicate_requests() {
 		let actions = sync.take_actions().collect::<Vec<_>>();
 
 		request = if actions.is_empty() {
-			// We found the ancenstor
+			// We found the ancestor
 			break
 		} else {
 			assert_eq!(actions.len(), 1);