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.~~

polkadot/roadmap/implementers-guide/src/runtime/README.md

@@ -89,7 +89,7 @@ struct SessionChangeNotification {
  prev_config: HostConfiguration,
  // The configuration after handling the session change.
  new_config: HostConfiguration,
- // A secure randomn seed for the session, gathered from BABE.
+ // A secure random seed for the session, gathered from BABE.
  random_seed: [u8; 32],
  // The session index of the beginning session.
  session_index: SessionIndex,

polkadot/roadmap/implementers-guide/src/runtime/hrmp.md

@@ -62,7 +62,7 @@ HRMP related storage layout
 HrmpOpenChannelRequests: map HrmpChannelId => Option<HrmpOpenChannelRequest>;
 HrmpOpenChannelRequestsList: Vec<HrmpChannelId>;
 
-/// This mapping tracks how many open channel requests are inititated by a given sender para.
+/// This mapping tracks how many open channel requests are initiated by a given sender para.
 /// Invariant: `HrmpOpenChannelRequests` should contain the same number of items that has `(X, _)`
 /// as the number of `HrmpOpenChannelRequestCount` for `X`.
 HrmpOpenChannelRequestCount: map ParaId => u32;
@@ -233,7 +233,7 @@ executed the message.
     1. Send a downward message to the opposite party notifying about the channel closing.
         * The DM is sent using `queue_downward_message`.
         * The DM is represented by the `HrmpChannelClosing` XCM message with:
-            * `initator` is set to `origin`,
+            * `initiator` is set to `origin`,
             * `sender` is set to `ch.sender`,
             * `recipient` is set to `ch.recipient`.
         * The opposite party is `ch.sender` if `origin` is `ch.recipient` and `ch.recipient` if `origin` is `ch.sender`.

polkadot/roadmap/implementers-guide/src/runtime/parainherent.md

@@ -88,7 +88,7 @@ to `sanitize_bitfields` function for implementation details.
 Backed candidates sanitization removes malformed ones, candidates which have got concluded invalid disputes against them
 or candidates produced by unassigned cores. Furthermore any backing votes from disabled validators for a candidate are
 dropped. This is part of the validator disabling strategy. After filtering the statements from disabled validators a
-backed candidate may end up with votes count less than `minimum_backing_votes` (a parameter from `HostConfiguiration`).
+backed candidate may end up with votes count less than `minimum_backing_votes` (a parameter from `HostConfiguration`).
 In this case the whole candidate is dropped otherwise it will be rejected by `process_candidates` from pallet inclusion.
 All checks related to backed candidates are implemented in `sanitize_backed_candidates` and
 `filter_backed_statements_from_disabled_validators`.