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/state-machine/src/trie_backend_essence.rs

@@ -34,8 +34,8 @@ use parking_lot::RwLock;
 use sp_core::storage::{ChildInfo, ChildType, StateVersion};
 use sp_trie::{
 	child_delta_trie_root, delta_trie_root, empty_child_trie_root,
-	read_child_trie_first_descedant_value, read_child_trie_hash, read_child_trie_value,
-	read_trie_first_descedant_value, read_trie_value,
+	read_child_trie_first_descendant_value, read_child_trie_hash, read_child_trie_value,
+	read_trie_first_descendant_value, read_trie_value,
 	trie_types::{TrieDBBuilder, TrieError},
 	DBValue, KeySpacedDB, MerkleValue, NodeCodec, PrefixedMemoryDB, Trie, TrieCache,
 	TrieDBRawIterator, TrieRecorder, TrieRecorderProvider,
@@ -554,7 +554,7 @@ where
 		let map_e = |e| format!("Trie lookup error: {}", e);
 
 		self.with_recorder_and_cache(None, |recorder, cache| {
-			read_trie_first_descedant_value::<Layout<H>, _>(self, &self.root, key, recorder, cache)
+			read_trie_first_descendant_value::<Layout<H>, _>(self, &self.root, key, recorder, cache)
 				.map_err(map_e)
 		})
 	}
@@ -570,7 +570,7 @@ where
 		let map_e = |e| format!("Trie lookup error: {}", e);
 
 		self.with_recorder_and_cache(Some(child_root), |recorder, cache| {
-			read_child_trie_first_descedant_value::<Layout<H>, _>(
+			read_child_trie_first_descendant_value::<Layout<H>, _>(
 				child_info.keyspace(),
 				self,
 				&child_root,