bug#21171: 25.0.50; Please document (and index) `with-silent-modifications' in Elisp manual

[Lars Ingebrigtsen]

Drew Adams <drew.adams@oracle.com> writes:

>> Subject line says it all.
>
> Nope.  And please state explicitly everything that it does -
> just what it saves and restores, inhibits, etc.  Otherwise,
> from the simple doc string alone it is not obvious what
> code (bindings etc.) this can replace.  Yes, a user can
> consult the source code, but there is no reason not to
> describe what it does in more detail than just "pretending
> it does not modify the buffer".

There is one use case only for the macro: Adding text properties to the
buffer without having the buffer-modified flag go off.

I've now rearranged the doc string to make that clearer.

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