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.~~

polkadot/xcm/xcm-builder/src/barriers.rs

@@ -142,7 +142,7 @@ impl<T: Contains<Location>> ShouldExecute for AllowTopLevelPaidExecutionFrom<T>
 /// In the above example, `AllowUnpaidExecutionFrom` appears once underneath
 /// `WithComputedOrigin`. This is in order to distinguish between messages which are notionally
 /// from a derivative location of `ParentLocation` but that just happened to be sent via
-/// `ParentLocaction` rather than messages that were sent by the parent.
+/// `ParentLocation` rather than messages that were sent by the parent.
 ///
 /// Similarly `AllowTopLevelPaidExecutionFrom` appears twice: once inside of `WithComputedOrigin`
 /// where we provide the list of origins which are derivative origins, and then secondly outside

polkadot/xcm/xcm-builder/src/tests/origins.rs

@@ -80,8 +80,8 @@ fn universal_origin_should_work() {
 fn export_message_should_work() {
 	// Bridge chain (assumed to be Relay) lets Parachain #1 have message execution for free.
 	AllowUnpaidFrom::set(vec![[Parachain(1)].into()]);
-	// Local parachain #1 issues a transfer asset on Polkadot Relay-chain, transfering 100 Planck to
-	// Polkadot parachain #2.
+	// Local parachain #1 issues a transfer asset on Polkadot Relay-chain, transferring 100 Planck
+	// to Polkadot parachain #2.
 	let expected_message = Xcm(vec![TransferAsset {
 		assets: (Here, 100u128).into(),
 		beneficiary: Parachain(2).into(),