[texdoc] `texdoc pgf` shows documentation for `pgf-soroban` package

[Philipp Stephani]

Hello,

since the last update `texdoc pgf` shows the documentation for the `pgf-soroban` package instead of the arguably more popular PGF/TikZ bundle:

~ $ texdoc -l -I pgf
 1 /usr/local/texlive/2010/texmf-dist/doc/latex/pgf-soroban/pgf-soroban-doc.pdf
   = Package documentation
 2 /usr/local/texlive/2010/texmf-dist/doc/latex/pgf-umlsd/pgf-umlsd-demo.pdf
   = Package demo
 3 /usr/local/texlive/2010/texmf-dist/doc/latex/pgf-umlsd/pgf-umlsd-demo2.pdf
   = Package demo (2)
 4 /usr/local/texlive/2010/texmf-dist/doc/generic/pgf/pgfmanual.pdf
 5 /usr/local/texlive/2010/texmf-dist/doc/generic/pgf/images/pgfmanual-mindmap-1.pdf
 6 /usr/local/texlive/2010/texmf-dist/doc/generic/pgf/images/pgfmanual-mindmap-2.pdf

Please change that.

Best,
Philipp