WIP: CI: add spellcheck (#3421)

* CI: add spellcheck

* revert me

* CI: explicit command for spellchecker

* spellcheck: edit misspells

* CI: run spellcheck on diff

* spellcheck: edits

* spellcheck: edit misspells

* spellcheck: add rules

* spellcheck: mv configs

* spellcheck: more edits

* spellcheck: chore

* spellcheck: one more thing

* spellcheck: and another one

* spellcheck: seems like it doesn't get to an end

* spellcheck: new words after rebase

* spellcheck: new words appearing out of nowhere

* chore

* review edits

* more review edits

* more edits

* wonky behavior

* wonky behavior 2

* wonky behavior 3

* change git behavior

* spellcheck: another bunch of new edits

* spellcheck: new words are koming out of nowhere

* CI: finding the master

* CI: fetching master implicitly

* CI: undebug

* new errors

* a bunch of new edits

* and some more

* Update node/core/approval-voting/src/approval_db/v1/mod.rs

Co-authored-by: Andronik Ordian <write@reusable.software>

* Update xcm/xcm-executor/src/assets.rs

Co-authored-by: Andronik Ordian <write@reusable.software>

* Apply suggestions from code review

Co-authored-by: Andronik Ordian <write@reusable.software>

* Suggestions from the code review

* CI: scan only changed files

Co-authored-by: Andronik Ordian <write@reusable.software>

polkadot/node/network/protocol/src/lib.rs

@@ -284,7 +284,7 @@ impl View {
 
 	/// Check if two views have the same heads.
 	///
-	/// Equivalent to the `PartialEq` fn,
+	/// Equivalent to the `PartialEq` function,
 	/// but ignores the `finalized_number` field.
 	pub fn check_heads_eq(&self, other: &Self) -> bool {
 		self.heads == other.heads
@@ -325,7 +325,7 @@ pub mod v1 {
 		/// Seconded statement with large payload (e.g. containing a runtime upgrade).
 		///
 		/// We only gossip the hash in that case, actual payloads can be fetched from sending node
-		/// via req/response.
+		/// via request/response.
 		#[codec(index = 1)]
 		LargeStatement(StatementMetadata),
 	}