[RFA, doc RFA] work around gold/15646

[Eli Zaretskii]

> From: Doug Evans <dje@google.com>
> Date: Wed, 19 Jun 2013 14:42:13 -0700
> 
> I've also updated the docs on .gdb_index to list the problem's with
> gold version 7 generated indices.
> 
> I wanted to document the Gold issues in the manual so that there's a
> more complete description of the differences between version 7 and 8.
> In doing so I found all the text regarding version differences to reduce
> the S/N ratio of the description of the format of the index.
> So I moved the version descriptions into a separate part.

Thank.  The documentation part is OK.