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/society/src/lib.rs

@@ -1509,7 +1509,7 @@ impl<T: Config<I>, I: 'static> Pallet<T, I> {
 		// the Founder.
 		if MemberCount::<T, I>::get() > 2 {
 			let defender = next_defender
-				.or_else(|| Self::pick_defendent(rng))
+				.or_else(|| Self::pick_defendant(rng))
 				.expect("exited if members empty; qed");
 			let skeptic =
 				Self::pick_member_except(rng, &defender).expect("exited if members empty; qed");
@@ -1871,7 +1871,7 @@ impl<T: Config<I>, I: 'static> Pallet<T, I> {
 	///
 	/// If only the Founder and Head members exist (or the state is inconsistent), then `None`
 	/// may be returned.
-	fn pick_defendent(rng: &mut impl RngCore) -> Option<T::AccountId> {
+	fn pick_defendant(rng: &mut impl RngCore) -> Option<T::AccountId> {
 		let member_count = MemberCount::<T, I>::get();
 		if member_count <= 2 {
 			return None
@@ -1976,7 +1976,7 @@ impl<T: Config<I>, I: 'static> Pallet<T, I> {
 	/// Transfer some `amount` from the main account into the payouts account and reduce the Pot
 	/// by this amount.
 	fn reserve_payout(amount: BalanceOf<T, I>) {
-		// Tramsfer payout from the Pot into the payouts account.
+		// Transfer payout from the Pot into the payouts account.
 		Pot::<T, I>::mutate(|pot| pot.saturating_reduce(amount));
 
 		// this should never fail since we ensure we can afford the payouts in a previous
@@ -1988,7 +1988,7 @@ impl<T: Config<I>, I: 'static> Pallet<T, I> {
 	/// Transfer some `amount` from the main account into the payouts account and increase the Pot
 	/// by this amount.
 	fn unreserve_payout(amount: BalanceOf<T, I>) {
-		// Tramsfer payout from the Pot into the payouts account.
+		// Transfer payout from the Pot into the payouts account.
 		Pot::<T, I>::mutate(|pot| pot.saturating_accrue(amount));
 
 		// this should never fail since we ensure we can afford the payouts in a previous