[Rd] R-ext.html should be R-exts.html in R-lang.html (PR#1180)

[baron@cattell.psych.upenn.edu]

<<insert bug report here>>

That's it.  Just a minor error in the links in R-lang.html.  I
noticed this in my error logs.  Seems that R-ext.html does not
exist.  Jon

--please do not edit the information below--

Version:
 platform = i686-pc-linux-gnu
 arch = i686
 os = linux-gnu
 system = i686, linux-gnu
 status = 
 major = 1
 minor = 3.1
 year = 2001
 month = 08
 day = 31
 language = R

Search Path:
 .GlobalEnv, package:ctest, Autoloads, package:base

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