doc.man.tex: \sf for sans seriffs is not supported
doc.tex, index.tex, java.tex: \section -> \secid

\section is used by LaTeX.
Also \chapter -> \chapid.
Removed some trailing spaces.
In java.tex removed some ISO 8859-1 codings.
T@x.tex: adecentamiento

iso8859-1 -> UTF-8
_$ -> $
deleted trailing spaces