hyperlinking fails for certain reference names (here: "HTTP/1.1")

[reschke]

See https://datatracker.ietf.org/doc/html/rfc9110#section-6.5.1:

   A trailer section is only possible when supported by the version of
   HTTP in use and enabled by an explicit framing mechanism.  For
   example, the chunked transfer coding in HTTP/1.1 allows a trailer
   section to be sent after the content (Section 7.1.2 of [HTTP/1.1]).

This incorrecty handles this as internal link, as "[HTTP/1.1]" is not recognized as link target.