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/primitives/state-machine/src/lib.rs

@@ -1451,7 +1451,7 @@ mod tests {
 		enum Item {
 			InitializationItem,
 			DiscardedItem,
-			CommitedItem,
+			CommittedItem,
 		}
 
 		let key = b"events".to_vec();
@@ -1488,21 +1488,21 @@ mod tests {
 
 			assert_eq!(ext.storage(key.as_slice()), Some(vec![Item::InitializationItem].encode()));
 
-			ext.storage_append(key.clone(), Item::CommitedItem.encode());
+			ext.storage_append(key.clone(), Item::CommittedItem.encode());
 
 			assert_eq!(
 				ext.storage(key.as_slice()),
-				Some(vec![Item::InitializationItem, Item::CommitedItem].encode()),
+				Some(vec![Item::InitializationItem, Item::CommittedItem].encode()),
 			);
 		}
 		overlay.start_transaction();
 
-		// Then only initlaization item and second (committed) item should persist.
+		// Then only initialization item and second (committed) item should persist.
 		{
 			let ext = Ext::new(&mut overlay, backend, None);
 			assert_eq!(
 				ext.storage(key.as_slice()),
-				Some(vec![Item::InitializationItem, Item::CommitedItem].encode()),
+				Some(vec![Item::InitializationItem, Item::CommittedItem].encode()),
 			);
 		}
 	}
@@ -1866,7 +1866,7 @@ mod tests {
 						// a inner hashable node
 						(&b"k"[..], Some(&long_vec[..])),
 						// need to ensure this is not an inline node
-						// otherwhise we do not know what is accessed when
+						// otherwise we do not know what is accessed when
 						// storing proof.
 						(&b"key1"[..], Some(&vec![5u8; 32][..])),
 						(&b"key2"[..], Some(&b"val3"[..])),