bug#31613: 27.0; `with-silent-modifications' in Elisp manual

[Eli Zaretskii]

> Date: Sun, 27 May 2018 20:38:43 -0700 (PDT)
> From: Drew Adams <drew.adams@oracle.com>
> 
> 1. The Elisp manual mentions this macro only in node `Changing
> Properties'.  The macro is not specific to the use case of adding or
> removing text properties without marking the buffer as modified.
> 
> Seems like it should be described accurately somewhere (else).

I added its description to where buffer modification is described.

> 2. The English should be corrected.  This text:
> 
> "If you wish to add or remove text properties to a buffer..."
> 
> should be something like this:
> 
> "If you wish to add text properties to a buffer or remove them from a
> buffer..."

Fixed.

Thanks.