[egcs-970828] Typo in "invoke.texi"

[Jeffrey A Law]

  In message < 199709012124.XAA05156@cor.dptmaths.ens-cachan.fr >you write:
  > 
  > 
  > 	While installing egcs-970828 on Solaris-2.5, I encountered
  > this error: 
Yes, there's a missing '@' in gcc.texi.  The next snapshot will
not have this problem.

Thanks,
Jeff