Minor changes in ?class (PR#2197)

[j.c.rougier@durham.ac.uk]

Hi everyone -- these are very minor. In the Arguments section of ?class,

1) it should read "an object" for x
2) "names" in Usage is not specified, it could be included along with 
"what", ie as

names,what: a character vector naming classes.

Cheers, Jonathan.

--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 = 6.0
 year = 2002
 month = 10
 day = 01
 language = R

Search Path:
 .GlobalEnv, Autoloads, package:base

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