typo in R-intro

R-intro.pdf contains 'expect' where I would expect 'except':

  13.3 Namespaces
  Packages can have namespaces, and currently all of the base and
recommended packages do
  expect the datasets package.

I've attached a patch to doc/manual/R-intro.texi.

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