Fix doc formatting written in unescaped file path

[ydah]

This fixes an issue where file paths were not escaped and were displayed as follows:

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Before submitting the PR make sure the following are checked:

• The PR relates to only one subject with a clear title and description in grammatically correct, complete sentences.
• Wrote good commit messages.
  • [-] Commit message starts with [Fix #issue-number] (if the related issue exists).
• Feature branch is up-to-date with master (if not - rebase it).
• Squashed related commits together.
  • [-] Added tests.
  • [-] Ran bundle exec rake default. It executes all tests and runs RuboCop on its own code.
  • [-] Added an entry (file) to the changelog folder named {change_type}_{change_description}.md if the new code introduces user-observable changes. See changelog entry format for details.

[koic]

docs/modules/ROOT/pages/cops_#{department}.adoc are documents generated by CopsDocumentationGenerator. So, CopsDocumentationGenerator needs to be fixed because regression will occur even if docs/modules/ROOT/pages/cops_#{department}.adoc are fixed directly.
https://github.com/rubocop/rubocop/blob/master/lib/rubocop/cops_documentation_generator.rb

[ydah]

I updated this PR. Thanks a lot!

docs/modules/ROOT/pages/cops_#{department}.adoc are documents generated by CopsDocumentationGenerator. So, CopsDocumentationGenerator

I have referred to #10405 in preparing this PR. I missed it💦

[koic]

Thanks!