Propose to add a new argument MULTILIB_REQUIRED in multilib framework

[Terry Guo]

Hi Joseph,

> 
> On Tue, 17 Apr 2012, Terry Guo wrote:
> 
> > 2012-04-17  Terry Guo  <terry.guo@arm.com>
> >
> >         * Makefile.in (s-mlib): Add new argument MULTILIB_REQUIRED.
> >         * genmultilib (MULTILIB_REQUIRED): New.
> 
> You need to add documentation in fragments.texi for MULTILIB_REQUIRED.
>

Thanks for your reminding. 
The attached patch added the missing documentation. Please help to review.

BR,
Terry

2012-05-03  Terry Guo  <terry.guo@arm.com>
 
      * doc/fragment.texi: Document MULTILIB_REQUIRED.
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