doc: Fix fec and code rate

[pradeeka7]

Summary

Fixed as per the comments.

Screenshots

Changes

• Removed the relationship between code and SF.
• ...

Notes for Reviewers

...

Checklist

• [X] Scope: The referenced issue is addressed, there are no unrelated changes.
• [X] Run Locally: Verified that the docs build using make server, posted screenshots, verified external links.
• [X] Style Guidelines: Documentation obeys style guidelines in CONTRIBUTING.
• [X] Commits: Commit messages follow guidelines in CONTRIBUTING, there are no fixup commits left.