[latexrefman] TeX format

[Karl Berry]

    I think that for accuracy we should remove this @cindex 

I changed the index entries to:

@cindex @TeX{} format (@code{.fmt}) files
@cindex @LaTeX{} format @(code{.fmt}) files

"LaTeX TeX format" makes sense in its way, but I think it would be
confusing for readers to me. -k