bug#22748: 24.5; (elisp) `Type Predicates': Repeat the rule from `Coding Conventions'

[Drew Adams]

(elisp) `Coding Conventions' makes clear that a predicate name that has
multiple words should end in `-p', not just `p'.  This should also be
made clear in node `Type Predicates', which currently says only this
about the naming:

  Following a general Lisp convention for predicate functions, most type
  predicates=A1=AF names end with =A1=AEp=A1=AF.

And that node should have a cross reference to node `Coding
Conventions', which details the "general Lisp convention for predicate
functions" that it refers to.


In GNU Emacs 24.5.1 (i686-pc-mingw32)
 of 2015-04-11 on LEG570
Windowing system distributor `Microsoft Corp.', version 6.1.7601
Configured using:
 `configure --prefix=3D/c/usr --host=3Di686-pc-mingw32'