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/staking/src/tests.rs

@@ -270,7 +270,7 @@ fn change_controller_works() {
 		assert_eq!(ledger.controller(), Some(stash));
 
 		// the raw storage ledger's controller is always `None`. however, we can still fetch the
-		// correct controller with `ledger.controler()`.
+		// correct controller with `ledger.controller()`.
 		let raw_ledger = <Ledger<Test>>::get(&stash).unwrap();
 		assert_eq!(raw_ledger.controller, None);
 
@@ -1257,7 +1257,7 @@ fn bond_extra_controller_bad_state_works() {
 		Bonded::<Test>::insert(31, 41);
 
 		// we confirm that the ledger is in bad state: 31 has 41 as controller and when fetching
-		// the ledger associated with the controler 41, its stash is 41 (and not 31).
+		// the ledger associated with the controller 41, its stash is 41 (and not 31).
 		assert_eq!(Ledger::<Test>::get(41).unwrap().stash, 41);
 
 		// if the ledger is in this bad state, the `bond_extra` should fail.
@@ -1815,7 +1815,7 @@ fn max_staked_rewards_works() {
 		let total_payout = treasury_payout + validators_payout;
 
 		// max stakers payout (without max staked rewards cap applied) is larger than the final
-		// validator rewards. The final payment and remainder should be adjusted by redestributing
+		// validator rewards. The final payment and remainder should be adjusted by redistributing
 		// the era inflation to apply the cap...
 		assert!(max_stakers_payout > validators_payout);
 
@@ -4686,7 +4686,7 @@ fn bond_during_era_does_not_populate_legacy_claimed_rewards() {
 			}
 		);
 
-		// make sure only era upto history depth is stored
+		// make sure only era up to history depth is stored
 		let current_era = 99;
 		mock::start_active_era(current_era);
 		bond_validator(13, 1000);
@@ -5412,7 +5412,7 @@ mod election_data_provider {
 					Event::SnapshotVotersSizeExceeded { size: 75 }
 				);
 
-				// however, if the election voter size bounds were largers, the snapshot would
+				// however, if the election voter size bounds were larger, the snapshot would
 				// include the electing voters of 70.
 				let bounds = ElectionBoundsBuilder::default().voters_size(1_000.into()).build();
 				assert_eq!(