user-manual: stop deprecating the manual

It's just as much a work-in-progress, but at least now it's gotten
enough technical review to shake out most of the really bad lies, so
hopefully it doesn't do any actual damage.  And if we encourage people
to read it, they'll be more likely to whine about it, which will help
get it fixed faster.
Signed-off-by: N"J. Bruce Fields" <bfields@citi.umich.edu>

Documentation/git.txt

@@ -21,10 +21,9 @@ and full access to internals.
 See this link:tutorial.html[tutorial] to get started, then see
 link:everyday.html[Everyday Git] for a useful minimum set of commands, and
 "man git-commandname" for documentation of each command.  CVS users may
-also want to read link:cvs-migration.html[CVS migration].
-link:user-manual.html[Git User's Manual] is still work in
-progress, but when finished hopefully it will guide a new user
-in a coherent way to git enlightenment ;-).
+also want to read link:cvs-migration.html[CVS migration].  See
+link:user-manual.html[Git User's Manual] for a more in-depth
+introduction.
 
 The COMMAND is either a name of a Git command (see below) or an alias
 as defined in the configuration file (see gitlink:git-config[1]).