chore: ci list files that spellcheck finds (#3992)

* chore: ci list files that spellcheck finds

Avoid -r flag for false positives

* avoid master

* improve

polkadot/.gitlab-ci.yml

@@ -242,8 +242,9 @@ spellcheck:
     - cargo spellcheck --version
     # compare with the commit parent to the PR, given it's from a default branch
     - git fetch origin +${CI_DEFAULT_BRANCH}:${CI_DEFAULT_BRANCH}
+    - cargo spellcheck list-files -vvv $(git diff --diff-filter=AM --name-only $(git merge-base ${CI_COMMIT_SHA} ${CI_DEFAULT_BRANCH}))
     - time cargo spellcheck check -vvv --cfg=scripts/gitlab/spellcheck.toml --checkers hunspell --code 1
-        -r $(git diff --name-only ${CI_COMMIT_SHA} $(git merge-base ${CI_COMMIT_SHA} ${CI_DEFAULT_BRANCH}))
+        $(git diff --diff-filter=AM --name-only $(git merge-base ${CI_COMMIT_SHA} ${CI_DEFAULT_BRANCH}))
   allow_failure:                   true
 
 build-adder-collator: