Cosmetic improvements to rs6000.h

[Stan Shebs]

Graham Stott wrote:
> 
> >   /* Define this macro if the register defined by
> >      `PIC_OFFSET_TABLE_REGNUM' is clobbered by calls.  Do not define
> > !    this macro if `PIC_OFFSET_TABLE_REGNUM' is not defined. */
> >
> 
> Minor nit there is supposed to be two spaces after the full stop at the
> end of a sentence.

Oops, I accidently reverted the last change to that line, will fix.

Stan