Request help with the interpretation of F5 URIs in the docs

Request help with the interpretation of F5 URIs in the docs

Some F5 VPNs use these to complete authentication and handoff to the
proprietary client, and we currently don't know how to interpret them in a
way that would allow OpenConnect to be used instead.

See https://gitlab.com/openconnect/openconnect/-/issues/639 and
https://lists.infradead.org/pipermail/openconnect-devel/2021-August/005035.html
for further discussion.

Signed-off-by: Daniel Lenski <dlenski@gmail.com>