Incorrect link generation for external RFC section/appendix references

[mohammadv184]

Problem Description

The script incorrectly handles hyperlinks for references that point to a specific section or appendix in an external RFC.

For example, in the text of RFC 5322, there is a reference to RFC 5234, Appendix B.1. The current htmlization script produces the following incorrect HTML:

<a href=".../rfc5234.html">RFC 5234</a>, <a href="#appendix-B.1">Appendix B.1</a>

This is wrong because:

1. It creates two separate links instead of one.

2. The link to "Appendix B.1" incorrectly points to a local anchor (#appendix-B.1) within the current document (RFC 5322), which does not exist.

The correct behavior would be to generate a single hyperlink pointing directly to the appendix within RFC 5234:

<a href=".../rfc5234.html#appendix-B.1">RFC 5234, Appendix B.1</a>