[Rd] dir.create typo in manual An Introduction to R

[John Blischak]

In the section FIles and Directories in the manual An Introduction to
R it refers to the function create.dir:

https://cran.r-project.org/doc/manuals/r-devel/R-intro.html#Files-and-directories

I've attached a patch against revision 72974 to change this to dir.create.

John
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Index: doc/manual/R-intro.texi
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--- doc/manual/R-intro.texi	(revision 72974)
+++ doc/manual/R-intro.texi	(working copy)
@@ -6567,7 +6567,7 @@
 pointers to some of the more commonly used ones.
 
 To create an (empty) file or directory, use @code{file.create} or
- at code{create.dir}.  (These are the analogues of the POSIX utilities
+ at code{dir.create}.  (These are the analogues of the POSIX utilities
 @command{touch} and @command{mkdir}.)  For temporary files and
 directories in the @R{} session directory see @code{tempfile}.