Patch to update format attribute docs

[Jeffrey A Law]

  In message <Pine.LNX.4.30.0011290053180.30672-100000@kern.srcf.societies.cam.
ac.uk>you write:
  > This patch updates the documented details of what format functions get
  > checked by default.  It passes "make info" and "make dvi".  OK to
  > commit?
  > 
  > 2000-11-29  Joseph S. Myers  <jsm28@cam.ac.uk>
  > 
  > 	* extend.texi: Update documentation for default format attributes.
This is fine.  Please install this patch.

Thanks,
jeff