Documentation update

What does this MR do and why?

Removes unneeded things from the debug documentation page.

Reference: #365302 (closed)

Screenshots or screen recordings

These are strongly recommended to assist reviewers and reduce the time to merge your change.

How to set up and validate locally

• Go to the debug page
• Notice there the gdb section removed

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.