bug#8935: 24.0.50; `substitute-command-keys' doc

[Drew Adams]

> > This is wrong, because \ by itself has no special meaning, 
> > so you don't need to precede it by \=.
> 
> I see.  I thought it worked the normal way, in that "\e" would be "e".

It does.  That is correct.

Andreas was wrong in saying it is wrong.

What is true is that \ by itself (not followed by [, =, etc.) does not _NEED_ to
be escaped.  But it is certainly true that \= escapes \, whether it needs to in
any given context (e.g. \[) or not (e.g. \ abc).  If it escapes a \ that does
not need escaping, the effect is a no-op.