relative href generated for some reason

[ajeanmahoney]

rfc2html took the following text in Section 2 of https://www.rfc-editor.org/rfc/rfc3233.txt:

  acts in accordance with BCP 9, BCP 10, and BCP 11.

And created the following HTML, and the relative href for BCP 11 is broken. There shouldn't be a relative href here:

acts in accordance with <a href="https://www.rfc-editor.org/bcp/bcp9">BCP 9</a>, <a href="https://www.rfc-editor.org/bcp/bcp10">BCP 10</a>, and <a href="./bcp11">BCP 11</a>.