[Rd] typo in R-ints

[Hin-Tak Leung]

Just been reading R internals, and noticed a typo (duplicate "should")
- patch attached, and also pasted below:

--- ./doc/manual/R-ints.texi.orig       2007-02-13 10:30:38.000000000 +0000
+++ ./doc/manual/R-ints.texi    2007-03-26 15:25:08.000000000 +0100
@@ -1093,7 +1093,7 @@
  contain references to environments, which then have enclosing
  environments and so on.  (Environments recognized as package or name
  space environments are saved by name.)  Further, there are `reference
-objects' which are not duplicated on copy and should should remain
+objects' which are not duplicated on copy and should remain
  shared on unserialization.  These are weak references, external pointers
  and environments other than those associated with packages, name spaces
  and the global environment.  These are handled via a hash table, and
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