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/sassafras/src/benchmarking.rs

@@ -84,7 +84,7 @@ mod benchmarks {
 	// - load the full ring context.
 	// - recompute the ring verifier.
 	// - sorting the epoch tickets in one shot
-	//  (here we account for the very unluky scenario where we haven't done any sort work yet)
+	//  (here we account for the very unlucky scenario where we haven't done any sort work yet)
 	// - pending epoch change config.
 	//
 	// For this bench we assume a redundancy factor of 2 (suggested value to be used in prod).

substrate/frame/sassafras/src/lib.rs

@@ -234,7 +234,7 @@ pub mod pallet {
 	/// Epoch X first N-th ticket has key (X mod 2, N)
 	///
 	/// Note that the ticket's index doesn't directly correspond to the slot index within the epoch.
-	/// The assigment is computed dynamically using an *outside-in* strategy.
+	/// The assignment is computed dynamically using an *outside-in* strategy.
 	///
 	/// Be aware that entries within this map are never removed, only overwritten.
 	/// Last element index should be fetched from the [`TicketsMeta`] value.
@@ -465,7 +465,7 @@ pub mod pallet {
 
 		/// Plan an epoch configuration change.
 		///
-		/// The epoch configuration change is recorded and will be announced at the begining
+		/// The epoch configuration change is recorded and will be announced at the beginning
 		/// of the next epoch together with next epoch authorities information.
 		/// In other words, the configuration will be enacted one epoch later.
 		///
@@ -758,11 +758,11 @@ impl<T: Config> Pallet<T> {
 		let randomness = hashing::blake2_256(buf.as_slice());
 		RandomnessAccumulator::<T>::put(randomness);
 
-		let next_randoness = Self::update_epoch_randomness(1);
+		let next_randomness = Self::update_epoch_randomness(1);
 
 		// Deposit a log as this is the first block in first epoch.
 		let next_epoch = NextEpochDescriptor {
-			randomness: next_randoness,
+			randomness: next_randomness,
 			authorities: Self::next_authorities().into_inner(),
 			config: None,
 		};