[Rd] Doc bug in ?legend on using bg if bty = "o" / "n" (PR#6294)

[ligges at statistik.uni-dortmund.de]

In ?legend (R-1.8.1 and R-devel), Section "Arguments", there is a 
documentation bug:

"bg  the background color for the legend box. (Note that this is only
used if bty = "n".)"

Instead, it is used if bty = "o", but *not* if bty = "n".

Uwe Ligges

--please do not edit the information below--

Version:
  platform = i386-pc-mingw32
  arch = i386
  os = mingw32
  system = i386, mingw32
  status = Under development (unstable)
  major = 1
  minor = 9.0
  year = 2004
  month = 01
  day = 01
  language = R

Windows NT 4.0 (build 1381) Service Pack 6

Search Path:
  .GlobalEnv, package:ctest, package:methods, package:stats, 
package:graphics, package:utils, Autoloads, package:base