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.~~

bridges/primitives/header-chain/src/justification/mod.rs

@@ -83,7 +83,7 @@ impl<H: HeaderT> GrandpaJustification<H> {
 			.saturating_add(HashOf::<C>::max_encoded_len().saturated_into());
 
 		let max_expected_votes_ancestries_size =
-			C::REASONABLE_HEADERS_IN_JUSTIFICATON_ANCESTRY.saturating_mul(C::AVERAGE_HEADER_SIZE);
+			C::REASONABLE_HEADERS_IN_JUSTIFICATION_ANCESTRY.saturating_mul(C::AVERAGE_HEADER_SIZE);
 
 		// justification is round number (u64=8b), a signed GRANDPA commit and the
 		// `votes_ancestries` vector

bridges/primitives/header-chain/src/justification/verification/mod.rs

@@ -318,7 +318,7 @@ trait JustificationVerifier<Header: HeaderT> {
 		}
 
 		// check that the cumulative weight of validators that voted for the justification target
-		// (or one of its descendents) is larger than the required threshold.
+		// (or one of its descendants) is larger than the required threshold.
 		if cumulative_weight < threshold {
 			return Err(Error::TooLowCumulativeWeight)
 		}

bridges/primitives/header-chain/src/lib.rs

@@ -283,7 +283,7 @@ pub trait ChainWithGrandpa: Chain {
 	/// ancestry and the pallet will accept such justification. The limit is only used to compute
 	/// maximal refund amount and submitting justifications which exceed the limit, may be costly
 	/// to submitter.
-	const REASONABLE_HEADERS_IN_JUSTIFICATON_ANCESTRY: u32;
+	const REASONABLE_HEADERS_IN_JUSTIFICATION_ANCESTRY: u32;
 
 	/// Maximal size of the mandatory chain header. Mandatory header is the header that enacts new
 	/// GRANDPA authorities set (so it has large digest inside).
@@ -317,8 +317,8 @@ where
 	const WITH_CHAIN_GRANDPA_PALLET_NAME: &'static str =
 		<T::Chain as ChainWithGrandpa>::WITH_CHAIN_GRANDPA_PALLET_NAME;
 	const MAX_AUTHORITIES_COUNT: u32 = <T::Chain as ChainWithGrandpa>::MAX_AUTHORITIES_COUNT;
-	const REASONABLE_HEADERS_IN_JUSTIFICATON_ANCESTRY: u32 =
-		<T::Chain as ChainWithGrandpa>::REASONABLE_HEADERS_IN_JUSTIFICATON_ANCESTRY;
+	const REASONABLE_HEADERS_IN_JUSTIFICATION_ANCESTRY: u32 =
+		<T::Chain as ChainWithGrandpa>::REASONABLE_HEADERS_IN_JUSTIFICATION_ANCESTRY;
 	const MAX_MANDATORY_HEADER_SIZE: u32 =
 		<T::Chain as ChainWithGrandpa>::MAX_MANDATORY_HEADER_SIZE;
 	const AVERAGE_HEADER_SIZE: u32 = <T::Chain as ChainWithGrandpa>::AVERAGE_HEADER_SIZE;
@@ -373,7 +373,7 @@ mod tests {
 	impl ChainWithGrandpa for TestChain {
 		const WITH_CHAIN_GRANDPA_PALLET_NAME: &'static str = "Test";
 		const MAX_AUTHORITIES_COUNT: u32 = 128;
-		const REASONABLE_HEADERS_IN_JUSTIFICATON_ANCESTRY: u32 = 2;
+		const REASONABLE_HEADERS_IN_JUSTIFICATION_ANCESTRY: u32 = 2;
 		const MAX_MANDATORY_HEADER_SIZE: u32 = 100_000;
 		const AVERAGE_HEADER_SIZE: u32 = 1_024;
 	}