bug#31311: 27.0; doc of `pcase'

[Michael Heerdegen]

Hi,

one thing I want to improve in the current docstring is the following
detail:

FUN in `pred' and `app' can take one of the forms:
  SYMBOL  or  (lambda ARGS BODY)
     call it with one argument
[...]

This doesn't tell which binding of SYMBOL is used (value vs. function
binding), but I think it should.  AFAICT only the function binding
matters, so we just could say "FBOUND-SYMBOL" instead of "SYMBOL".  Or
something better?

Thanks, Michael.