Reason for Proposed Changes

• Invalid Media Type Value openAPI query was incorrectly flagging when content was not an object;

Proposed Changes

• fix FP on Invalid Media Type Value openAPI query which now checks if the content is an object or not;
• fix documentation to properly explain how a media type should be constructed;
• add negative unit tests to ensure no regression issues;
• fix typo on expectedValue (from a to an);

I submit this contribution under the Apache-2.0 license.