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/primitives/io/src/lib.rs

@@ -1081,7 +1081,7 @@ pub trait Crypto {
 	/// Register a `ecdsa` signature for batch verification.
 	///
 	/// Batch verification must be enabled by calling [`start_batch_verify`].
-	/// If batch verification is not enabled, the signature will be verified immediatley.
+	/// If batch verification is not enabled, the signature will be verified immediately.
 	/// To get the result of the batch verification, [`finish_batch_verify`]
 	/// needs to be called.
 	///
@@ -1696,9 +1696,9 @@ mod tracing_setup {
 
 	/// The PassingTracingSubscriber implements `tracing_core::Subscriber`
 	/// and pushes the information across the runtime interface to the host
-	struct PassingTracingSubsciber;
+	struct PassingTracingSubscriber;
 
-	impl tracing_core::Subscriber for PassingTracingSubsciber {
+	impl tracing_core::Subscriber for PassingTracingSubscriber {
 		fn enabled(&self, metadata: &Metadata<'_>) -> bool {
 			wasm_tracing::enabled(Crossing(metadata.into()))
 		}
@@ -1731,7 +1731,7 @@ mod tracing_setup {
 	/// set the global bridging subscriber once.
 	pub fn init_tracing() {
 		if TRACING_SET.load(Ordering::Relaxed) == false {
-			set_global_default(Dispatch::new(PassingTracingSubsciber {}))
+			set_global_default(Dispatch::new(PassingTracingSubscriber {}))
 				.expect("We only ever call this once");
 			TRACING_SET.store(true, Ordering::Relaxed);
 		}