[Rd] Two typos in manuals

[Mikko Korpela]

I think that in doc/manual/R-intro.texi, "used a part of an even larger 
expression" should be "used as part of an even larger expression".

Another suspected typo is in doc/manual/R-ints.texi, where "dialects of 
TeX and used for different purposes" should probably be "dialects of TeX 
are used for different purposes".

A patch file against R-devel revision 71696 is included.

-- 
Mikko Korpela
Department of Geosciences and Geography
University of Helsinki
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