editors/enter-tex: DOCS option, tex-formats, fix URLs

Re-add the print/tex-formats RUN_DEPENDS from before the rename,
as a TeX editor without a distribution is nearly useless.

Upstream URLs were updated but only GL_ACCOUNT was accounted for,
so fix WWW and other places to match. Bump PORTREVISION mostly for
this metadata change.

While here, move the manual build step prior to the main build into
pre-build rather than overriding do-build.