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/frame/election-provider-multi-phase/src/helpers.rs

@@ -160,7 +160,7 @@ pub fn target_index_fn_linear<T: MinerConfig>(
 }
 
 /// Create a function that can map a voter index ([`SolutionVoterIndexOf`]) to the actual voter
-/// account using a linearly indexible snapshot.
+/// account using a linearly indexable snapshot.
 pub fn voter_at_fn<T: MinerConfig>(
 	snapshot: &Vec<MinerVoterOf<T>>,
 ) -> impl Fn(SolutionVoterIndexOf<T>) -> Option<T::AccountId> + '_ {
@@ -172,7 +172,7 @@ pub fn voter_at_fn<T: MinerConfig>(
 }
 
 /// Create a function that can map a target index ([`SolutionTargetIndexOf`]) to the actual target
-/// account using a linearly indexible snapshot.
+/// account using a linearly indexable snapshot.
 pub fn target_at_fn<T: MinerConfig>(
 	snapshot: &Vec<T::AccountId>,
 ) -> impl Fn(SolutionTargetIndexOf<T>) -> Option<T::AccountId> + '_ {

substrate/frame/election-provider-multi-phase/src/lib.rs

@@ -1134,7 +1134,7 @@ pub mod pallet {
 		/// A solution was stored with the given compute.
 		///
 		/// The `origin` indicates the origin of the solution. If `origin` is `Some(AccountId)`,
-		/// the stored solution was submited in the signed phase by a miner with the `AccountId`.
+		/// the stored solution was submitted in the signed phase by a miner with the `AccountId`.
 		/// Otherwise, the solution was stored either during the unsigned phase or by
 		/// `T::ForceOrigin`. The `bool` is `true` when a previous solution was ejected to make
 		/// room for this one.
@@ -1192,7 +1192,7 @@ pub mod pallet {
 		BoundNotMet,
 		/// Submitted solution has too many winners
 		TooManyWinners,
-		/// Sumission was prepared for a different round.
+		/// Submission was prepared for a different round.
 		PreDispatchDifferentRound,
 	}
 

substrate/frame/election-provider-multi-phase/src/unsigned.rs

@@ -1445,7 +1445,7 @@ mod tests {
 				)
 				.unwrap();
 				let solution = RawSolution { solution: raw, score, round: MultiPhase::round() };
-				// 12 is not better than 12. We need score of atleast 13 to be accepted.
+				// 12 is not better than 12. We need score of at least 13 to be accepted.
 				assert_eq!(solution.score.minimal_stake, 12);
 				// submitting this will panic.
 				assert_noop!(
@@ -1483,7 +1483,7 @@ mod tests {
 				));
 
 				// trial 4: a solution who's minimal stake is 17, i.e. 4 better than the last
-				// soluton.
+				// solution.
 				let result = ElectionResult {
 					winners: vec![(10, 12)],
 					assignments: vec![