bug#45715: 27.1; Doc string of `dotimes'

[Drew Adams]

  Loop a certain number of times.
  Evaluate BODY with VAR bound to successive integers running from 0,
  inclusive, to COUNT, exclusive.  Then evaluate RESULT to get the
  return value (nil if RESULT is omitted).  Its use is deprecated.
                                            ^^^

In the last sentence, "its" is unclear.  Also, that sentence is missing
from the doc string of `cl-dotimes', even though it is present in the CL
Info manual.  And for `cl-dotimes' it should be made clear that this
"deprecation" is only about the Emacs Lisp emulation; the RETURN arg for
Common Lisp `dotimes' has not been deprecated.


In GNU Emacs 27.1 (build 1, x86_64-w64-mingw32)
 of 2020-08-12
Repository revision: 86d8d76aa36037184db0b2897c434cdaab1a9ae8
Windowing system distributor `Microsoft Corp.', version 10.0.18362
Configured using:
 `configure --without-dbus --host=x86_64-w64-mingw32
 --without-compress-install 'CFLAGS=-O2 -static''