bug#33084: 26.1.50; Outdated revert-buffer documentation

[Mauro Aranda]

Hello.

Regarding the Emacs manual, I think the following paragraph in the
"Reverting a Buffer" section is outdated:
"Reverting marks the buffer as not modified. It also clears the buffer's undo
history (see Undo). Thus, the reversion cannot be undone—if you change your
mind yet again, you can't use the undo commands to bring the reverted changes
back."

I think that was the previous behavior of revert-buffer, but it was changed
a while ago, so now it is possible to do M-x revert-buffer RET yes RET
and then do
C-/ to bring the reverted changes back.


In GNU Emacs 26.1.50 (build 3, i686-pc-linux-gnu, GTK+ Version 3.18.9)
 of 2018-10-16 built on the-blackbeard
Repository revision: 433e364add25dcc32f5103ec28f58298e00204d5
Windowing system distributor 'The X.Org Foundation', version 11.0.11906000
System Description:     Ubuntu 16.04.5 LTS