Fix inconsistent RFC links in documentation

[volfco]

There are some invalid links in the documentation, which can result in the user writing this PR and forgetting what they were working on in the first place.

Related Issue or Design Document

see above

Checklist

• I have read the contributing guidelines and signed the CLA.
• [no] I have referenced an issue containing the design document if my change introduces a new feature.
• [no] I have read the security policy.
• [+] I confirm that this pull request does not address a security vulnerability.
  If this pull request addresses a security vulnerability,
  I confirm that I got approval (please contact [email protected]) from the maintainers to push the changes.
• [] I have added tests that prove my fix is effective or that my feature works.
• I have added the necessary documentation within the code base (if appropriate).

Further comments

/search/... should be /html/...

[CLAassistant]

All committers have signed the CLA.