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/broker/src/lib.rs

@@ -683,7 +683,7 @@ pub mod pallet {
 		/// - `origin`: Must be a Signed origin of the account which owns the Region `region_id`.
 		/// - `region_id`: The Region which was assigned to the Pool.
 		/// - `max_timeslices`: The maximum number of timeslices which should be processed. This may
-		///   effect the weight of the call but should be ideally made equivalant to the length of
+		///   effect the weight of the call but should be ideally made equivalent to the length of
 		///   the Region `region_id`. If it is less than this, then further dispatches will be
 		///   required with the `region_id` which makes up any remainders of the region to be
 		///   collected.

substrate/frame/broker/src/types.rs

@@ -55,7 +55,7 @@ pub enum Finality {
 pub struct RegionId {
 	/// The timeslice at which this Region begins.
 	pub begin: Timeslice,
-	/// The index of the Polakdot Core on which this Region will be scheduled.
+	/// The index of the Polkadot Core on which this Region will be scheduled.
 	pub core: CoreIndex,
 	/// The regularity parts in which this Region will be scheduled.
 	pub mask: CoreMask,
@@ -198,7 +198,7 @@ pub struct PoolIoRecord {
 	/// The total change of the portion of the pool supplied by purchased Bulk Coretime, measured
 	/// in Core Mask Bits.
 	pub private: SignedCoreMaskBitCount,
-	/// The total change of the portion of the pool supplied by the Polkaot System, measured in
+	/// The total change of the portion of the pool supplied by the Polkadot System, measured in
 	/// Core Mask Bits.
 	pub system: SignedCoreMaskBitCount,
 }