user-manual: run xsltproc without --nonet option
user-manual: run xsltproc without --nonet option

The --nonet option prevents xsltproc from going to the network to find
anything.  But it always tries to find them locally first, so for a
user with the necessary docbook stylesheets installed the build will
work just fine without xsltproc attempting to use the network; all
--nonet does is make it fail rather than falling back on that.  That
doesn't seem particularly helpful.

Signed-off-by: "J. Bruce Fields" <51738506c1b2ccb0761f23bdc612c93babf738ea@citi.umich.edu>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git