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/rpc-spec-v2/src/transaction/tests/transaction_broadcast_tests.rs

@@ -372,7 +372,7 @@ async fn tx_broadcast_resubmits_invalid_tx() {
 	client_mock.trigger_import_stream(block_2_header).await;
 
 	// Ensure we propagate the temporary ban error to `submit_and_watch`.
-	// This ensures we'll loop again with the next annmounced block and try to resubmit the
+	// This ensures we'll loop again with the next announced block and try to resubmit the
 	// transaction. The transaction remains temporarily banned until the pool is maintained.
 	let event = get_next_event!(&mut pool_middleware);
 	assert_matches!(event, MiddlewarePoolEvent::PoolError { transaction, err } if transaction == xt && err.contains("Transaction temporarily Banned"));
@@ -429,7 +429,7 @@ async fn tx_broadcast_resubmits_invalid_tx() {
 }
 
 /// This is similar to `tx_broadcast_resubmits_invalid_tx`.
-/// However, it forces the tx to be resubmited because of the pool
+/// However, it forces the tx to be resubmitted because of the pool
 /// limits. Which is a different code path than the invalid tx.
 #[tokio::test]
 async fn tx_broadcast_resubmits_dropped_tx() {
@@ -509,7 +509,7 @@ async fn tx_broadcast_resubmits_dropped_tx() {
 	pool.inner_pool.maintain(event).await;
 	client_mock.trigger_import_stream(block_3_header.clone()).await;
 
-	// The first tx is in a finalzied block; the future tx must enter the pool.
+	// The first tx is in a finalized block; the future tx must enter the pool.
 	let events = get_next_tx_events!(&mut pool_middleware, 3);
 	assert_eq!(
 		events.get(&current_xt).unwrap(),

substrate/client/rpc-spec-v2/src/transaction/transaction_broadcast.rs

@@ -44,7 +44,7 @@ pub struct TransactionBroadcast<Pool, Client> {
 	pool: Arc<Pool>,
 	/// Executor to spawn subscriptions.
 	executor: SubscriptionTaskExecutor,
-	/// The brodcast operation IDs.
+	/// The broadcast operation IDs.
 	broadcast_ids: Arc<RwLock<HashMap<String, BroadcastState>>>,
 }
 
@@ -200,7 +200,7 @@ where
 	}
 }
 
-/// Returns the last element of the providided stream, or `None` if the stream is closed.
+/// Returns the last element of the provided stream, or `None` if the stream is closed.
 async fn last_stream_element<S>(stream: &mut S) -> Option<S::Item>
 where
 	S: Stream + Unpin,