a major typo in the grep man page

[Raven Morris]

I know that the GNU Project primarily focuses on info-pages for
documentation, however the man pages should at least have the correct
switches listed.  In the grep man page it lists the following:

--line-buffering
      Use line buffering, it can be a performance penality.

However, the correct switch is --line-buffered.

Thank you,

 - raven morris