[Rd] documentation for representation() typo

[Roebuck,Paul L]

<https://svn.r-project.org/R/trunk/src/library/methods/man/representation.R>


50c50
<  The value of \code{representation} is just the list of arguments
---
>  The value pf \code{representation}  is just the list of arguments, after
these have been checked


51c51
<  after these have been checked for validity.
---
>  for validity.