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/treasury/src/lib.rs

@@ -621,7 +621,7 @@ pub mod pallet {
 			with_context::<SpendContext<BalanceOf<T, I>>, _>(|v| {
 				let context = v.or_default();
 
-				// We group based on `max_amount`, to dinstinguish between different kind of
+				// We group based on `max_amount`, to distinguish between different kind of
 				// origins. (assumes that all origins have different `max_amount`)
 				//
 				// Worst case is that we reject some "valid" request.
@@ -1042,7 +1042,7 @@ impl<T: Config<I>, I: 'static> Pallet<T, I> {
 	/// ### Invariants of proposal storage items
 	///
 	/// 1. [`ProposalCount`] >= Number of elements in [`Proposals`].
-	/// 2. Each entry in [`Proposals`] should be saved under a key stricly less than current
+	/// 2. Each entry in [`Proposals`] should be saved under a key strictly less than current
 	/// [`ProposalCount`].
 	/// 3. Each [`ProposalIndex`] contained in [`Approvals`] should exist in [`Proposals`].
 	/// Note, that this automatically implies [`Approvals`].count() <= [`Proposals`].count().
@@ -1078,7 +1078,7 @@ impl<T: Config<I>, I: 'static> Pallet<T, I> {
 	/// ## Invariants of spend storage items
 	///
 	/// 1. [`SpendCount`] >= Number of elements in [`Spends`].
-	/// 2. Each entry in [`Spends`] should be saved under a key stricly less than current
+	/// 2. Each entry in [`Spends`] should be saved under a key strictly less than current
 	/// [`SpendCount`].
 	/// 3. For each spend entry contained in [`Spends`] we should have spend.expire_at
 	/// > spend.valid_from.