[Rd] trivial typo in "writing r extensions"

[Ben Bolker]

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 "followed" on line 423 of R-exts.texi should probably be "followed
by" (or you could say "'followed' on line 423 should probably followed
by 'by'" :-) )

  cheers
    Ben Bolker

===================================================================
- --- R-exts.texi	(revision 63524)
+++ R-exts.texi	(working copy)
@@ -420,7 +420,7 @@

 @c DESCRIPTION field Maintainer
 The mandatory @samp{Maintainer} field should give a @emph{single} name
- -followed a @emph{valid} (RFC 2822) email address in angle brackets.  It
+followed by a @emph{valid} (RFC 2822) email address in angle
brackets.  It
 should not end in a period or comma.  This field is what is reported by
 the @code{maintainer} function and used by @code{bug.report}.  For a
 @acronym{CRAN} package it should be a @emph{person}, not a mailing list
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