typo in R-ints.texi's description of P_ macro

I think there are some missing words in "R Internals"'s description of
the P_ macro.
It currently has "A macro as a wrapper for ngettext", which I think
ought to be
something like "The macro P_ may be used as a wrapper for ngettext".

The following patch also makes the 2 alternate definitions of P_ have
the same argument names,
StringS and StringP.  Expanding the S and P to Singular and Plural,
would be more descriptive. 

Bill Dunlap
TIBCO Software Inc - Spotfire Division
wdunlap tibco.com 


Index: doc/manual/R-ints.texi
===================================================================
--- doc/manual/R-ints.texi      (revision 48294)
+++ doc/manual/R-ints.texi      (working copy)
@@ -2149,17 +2149,18 @@
 @noindent
 from @file{src/main/errors.c}.

-A macro
+The @code{P_} macro

 @example
 #ifdef ENABLE_NLS
 #define P_(StringS, StringP, N) ngettext (StringS, StringP, N)
 #else
-#define P_(String, StringP, N) (N > 1 ? StringP: String)
+#define P_(StringS, StringP, N) (N > 1 ? StringP: StringS)
 #endif
 @end example

 @noindent
+may be used
 as a wrapper for @code{ngettext}: however in some cases the preferred
 approach has been to conditionalize (on @code{ENABLE_NLS}) code using
 @code{ngettext}.