fix: improve markdown render with CRLF

[AlexVarchuk]

What/Why/How?

fixes: #1952.
In #1845 we improve our build heading regex but not include all CRLF symbols. This PR should fix it.

Reference

Testing

{
  "openapi": "3.0.1",
  "info": {
    "title": "Minimal Example JSON",
    "description": "# Getting Started\r\n## Authentication\r\nAll API Requests _must_ contain an Authorization Header with a valid access token",
    "contact": {
      "name": "Name",
      "email": "email@example.com"
    },
    "version": "v3.0: 3.10.0.0"
  }
}

Screenshots (optional)

Before

After

Check yourself

• Code is linted
• Tested
• All new/updated code is covered with tests