[Rd] Minor documentation problem for library (PR#3866)

[ross at biostat.ucsf.edu]

In my 1.7.1 R (on Debian) the help for "library" includes the line
     `as.environment(match("package:name"), search())' will return the
There is a misplaced parenthesis.  I think you mean
     `as.environment(match("package:name", search()))' will return the

This might be a duplicate submission.  I tried to send one from within
an ESS session, but the session disappeared (which might be a separate
bug!).