error in make.names docs (PR#6912)

Prof Brian Ripley <ripley@stats.ox.ac.uk> writes:

Example output in comment is now corrected in R-patched.
What has the rest to do with a bug report?

He's hoping (with some reason) that the change of behaviour was the
bug. I seem to recall some internal discussion of the effect, but not
whether it just got forgotten or whether you might as well just do 
gsub(...something...) on the names of the dataframe.

O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard@biostat.ku.dk)             FAX: (+45) 35327907