[Bug tapsets/27187] Introduce user_buffer_hex and kernel_buffer_hex helpers in conversions tapsets

["craig.ringer at 2ndquadrant dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=27187

--- Comment #2 from Craig Ringer <craig.ringer at 2ndquadrant dot com> ---
Created attachment 13131
  --> https://sourceware.org/bugzilla/attachment.cgi?id=13131&action=edit
Docs x-ref for %.*M etc

Well, now I feel really, really dumb. Oh well, I learned some useful things.

Replacement patch attached that points this out in the docs for
user_buffer_quoted() and user_string().

I took a quick look to see if I could work out how to create a function::printf
and function::sprintf manpage to x-ref the stap(1) content, but didn't work out
a way to do so without injecting a tapset function for printf and sprintf.

I guess I could put them in a dummy tapset with no actual definitions or wedge
them into uconversions.stp, but neither seems very pretty.

Anyway, docs patch attached. I'll confirm whether it can fully replace my use
of user_buffer_hex.

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