Revert "Update CONTRIBUTING.md"

This reverts commit 17ab8d6.

Author: ralfhandl

CONTRIBUTING.md

@@ -214,11 +214,6 @@ Plus some suggestions, rather than rules:
 * property of a "plain" JSON object that is not an OpenAPI-defined Foo Object -> "property"
 * "attribute" is only used in the XML context and means "XML attribute"
 
-### Field Names and Values in YAML comments
-
-Field names and entries such as content types should be in backticks, they would be fixed-width fonts if the markdown was rendered (which the comments are not).
-Values like "Dog" should be double quoted as they are a value rather than a keyword.
-
 ## Release Process and Scope
 
 This section relates to the 3.x versions only.