bug#47220: 26.3; Doc of `buffer-string'

[Drew Adams]

Please consider mentioning, in both the doc string and the Elisp manual,
that the result includes any text properties of the text that's copied.

Elisp manual and doc string for `buffer-substring' say this.  It's not
obvious that the same is true for `buffer-string'.


In GNU Emacs 26.3 (build 1, x86_64-w64-mingw32)
 of 2019-08-29
Repository revision: 96dd0196c28bc36779584e47fffcca433c9309cd
Windowing system distributor `Microsoft Corp.', version 10.0.19041
Configured using:
 `configure --without-dbus --host=x86_64-w64-mingw32
 --without-compress-install 'CFLAGS=-O2 -static -g3''