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/support/src/storage/mod.rs

@@ -159,7 +159,7 @@ pub trait StorageValue<T: FullCodec> {
 	///
 	/// # Warning
 	///
-	/// `None` does not mean that `get()` does not return a value. The default value is completly
+	/// `None` does not mean that `get()` does not return a value. The default value is completely
 	/// ignored by this function.
 	fn decode_len() -> Option<usize>
 	where
@@ -363,7 +363,7 @@ pub trait StorageMap<K: FullEncode, V: FullCodec> {
 	///
 	/// # Warning
 	///
-	/// `None` does not mean that `get()` does not return a value. The default value is completly
+	/// `None` does not mean that `get()` does not return a value. The default value is completely
 	/// ignored by this function.
 	fn decode_len<KeyArg: EncodeLike<K>>(key: KeyArg) -> Option<usize>
 	where
@@ -381,7 +381,8 @@ pub trait StorageMap<K: FullEncode, V: FullCodec> {
 	///
 	/// # Warning
 	///
-	///  - `None` does not mean that `get()` does not return a value. The default value is completly
+	///  - `None` does not mean that `get()` does not return a value. The default value is
+	///    completely
 	/// ignored by this function.
 	///
 	/// - The value returned is the non-deduplicated length of the underlying Vector in storage.This
@@ -410,7 +411,7 @@ pub trait StorageMap<K: FullEncode, V: FullCodec> {
 pub trait IterableStorageMap<K: FullEncode, V: FullCodec>: StorageMap<K, V> {
 	/// The type that iterates over all `(key, value)`.
 	type Iterator: Iterator<Item = (K, V)>;
-	/// The type that itereates over all `key`s.
+	/// The type that iterates over all `key`s.
 	type KeyIterator: Iterator<Item = K>;
 
 	/// Enumerate all elements in the map in lexicographical order of the encoded key. If you
@@ -777,7 +778,7 @@ pub trait StorageDoubleMap<K1: FullEncode, K2: FullEncode, V: FullCodec> {
 	///
 	/// # Warning
 	///
-	/// `None` does not mean that `get()` does not return a value. The default value is completly
+	/// `None` does not mean that `get()` does not return a value. The default value is completely
 	/// ignored by this function.
 	fn decode_len<KArg1, KArg2>(key1: KArg1, key2: KArg2) -> Option<usize>
 	where
@@ -798,7 +799,7 @@ pub trait StorageDoubleMap<K1: FullEncode, K2: FullEncode, V: FullCodec> {
 	///
 	/// # Warning
 	///
-	/// `None` does not mean that `get()` does not return a value. The default value is completly
+	/// `None` does not mean that `get()` does not return a value. The default value is completely
 	/// ignored by this function.
 	fn decode_non_dedup_len<KArg1, KArg2>(key1: KArg1, key2: KArg2) -> Option<usize>
 	where
@@ -980,7 +981,7 @@ pub trait StorageNMap<K: KeyGenerator, V: FullCodec> {
 	///
 	/// # Warning
 	///
-	/// `None` does not mean that `get()` does not return a value. The default value is completly
+	/// `None` does not mean that `get()` does not return a value. The default value is completely
 	/// ignored by this function.
 	fn decode_len<KArg: EncodeLikeTuple<K::KArg> + TupleToEncodedIter>(key: KArg) -> Option<usize>
 	where
@@ -1488,8 +1489,8 @@ pub trait StorageDecodeLength: private::Sealed + codec::DecodeLength {
 	}
 }
 
-/// It is expected that the length is at the beginning of the encoded objectand that the length is a
-/// `Compact<u32>`.
+/// It is expected that the length is at the beginning of the encoded object and that the length is
+/// a `Compact<u32>`.
 ///
 /// # Note
 /// The length returned by this trait is not deduplicated, i.e. it is the length of the underlying
@@ -1790,7 +1791,7 @@ mod test {
 		});
 	}
 
-	// This test ensures that the Digest encoding does not change without being noticied.
+	// This test ensures that the Digest encoding does not change without being noticed.
 	#[test]
 	fn digest_storage_append_works_as_expected() {
 		TestExternalities::default().execute_with(|| {