[Rd] trivial typo in R-exts.texi

[Ben Bolker]

>From latest SVN release (66624).

 (I think I may have reported this before?)

430- at c DESCRIPTION field Maintainer
431-The mandatory @samp{Maintainer} field should give a @emph{single} name
432:followed a @emph{valid} (RFC 2822) email address in angle brackets.  It
433-should not end in a period or comma.  This field is what is reported by


"followed a" should be "followed by a", I think ...

  Ben Bolker