[texdoc] texdoc context

[Karl Berry]

Hi Manuel,

$ texdoc -l context
 1 /u/local/texlive/2011/texmf-dist/doc/context/third/context-notes-zh-cn/ctxnotes.pdf
   = The document itself
 2 /u/local/texlive/2011/texmf-dist/doc/context/third/gnuplot/gnuplot-context-doc.pdf
 3 /u/local/texlive/2011/texmf/doc/man/man1/context.man1.pdf
 4 /u/local/texlive/2011/texmf-dist/doc/context/third/context-notes-zh-cn/README
   = Readme

Even though it is an unfortunate special case, I suggest that it would
be more useful to return the man page (#3) for context rather than the
Chinese "notes" document.

Also, it would perhaps be useful to return
context/manuals/reference/en/contextref.pdf somewhere in the list, but
probably not first -- 374 pages is a bit overwhelming.

Best,
k