bug#35309: 26.2; Doc strings of `extended-command-suggest-shorter' and `suggest-key-bindings'

[Drew Adams]

Please consider adding to each of these doc strings a mention to see
also the other.  The behaviors controlled by these two options are
very similar/related.

(In fact, it might have been better to have a single option with
multiple values.  Users should be able to configure the behavior in a
single place, and they should be able to apply the same kind of wait
behavior for the `M-x <abbreviation>' display as for a key binding
display.)


In GNU Emacs 26.2 (build 1, x86_64-w64-mingw32)
 of 2019-04-13
Repository revision: fd1b34bfba8f3f6298df47c8e10b61530426f749
Windowing system distributor `Microsoft Corp.', version 10.0.17134
Configured using:
 `configure --without-dbus --host=x86_64-w64-mingw32
 --without-compress-install 'CFLAGS=-O2 -static -g3''