bug#8682: 24.0.50; doc strings of `isearch-mode', `isearch-forward', etc.

[Stefan Monnier]

> If you don't like `-P' because you think it too closely conveys
> "predicate" (and you don't want to consider a variable as a nullary
> predicate), then choose another naming convention for this.  It is
> quite helpful to suggest by a parameter's name that it represents
> a truth value: nil/non-nil.

`forward' works just fine, `recursive' as well.
I agree that `regexp' isn't quite as clear because it's a substantive so
it could also be understood to carry a regular expression, so you may
prefer `use-regexp' or something like that.


        Stefan