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/client/executor/wasmtime/src/runtime.rs

@@ -462,7 +462,7 @@ pub struct Semantics {
 pub struct Config {
 	/// The WebAssembly standard requires all imports of an instantiated module to be resolved,
 	/// otherwise, the instantiation fails. If this option is set to `true`, then this behavior is
-	/// overriden and imports that are requested by the module and not provided by the host
+	/// overridden and imports that are requested by the module and not provided by the host
 	/// functions will be resolved using stubs. These stubs will trap upon a call.
 	pub allow_missing_func_imports: bool,
 

substrate/client/executor/wasmtime/src/tests.rs

@@ -254,7 +254,7 @@ fn test_nan_canonicalization(instantiation_strategy: InstantiationStrategy) {
 
 	/// A NaN with canonical payload bits.
 	const CANONICAL_NAN_BITS: u32 = 0x7fc00000;
-	/// A NaN value with an abitrary payload.
+	/// A NaN value with an arbitrary payload.
 	const ARBITRARY_NAN_BITS: u32 = 0x7f812345;
 
 	// This test works like this: we essentially do
@@ -272,7 +272,7 @@ fn test_nan_canonicalization(instantiation_strategy: InstantiationStrategy) {
 	// However, with the `canonicalize_nans` option turned on above, we expect that the output will
 	// be a canonical NaN.
 	//
-	// We exterpolate the results of this tests so that we assume that all intermediate computations
+	// We extrapolate the results of this tests so that we assume that all intermediate computations
 	// that involve floats are sanitized and cannot produce a non-deterministic NaN.
 
 	let params = (u32::to_le_bytes(ARBITRARY_NAN_BITS), u32::to_le_bytes(1)).encode();