net/9p: Change linuxdoc names to match functions.

As on Jeopardy, my question is in the form of a patch:  Does this have
some special meaning, or is it an accident?  (I looked at other
filesystems but they didn't bother having doc entries for their
init/exit function that I could find.)
Signed-off-by: NRob Landley <rob@landley.net>
Signed-off-by: NEric Van Hensbergen <ericvh@gmail.com>

net/9p/mod.c

@@ -139,7 +139,7 @@ void v9fs_put_trans(struct p9_trans_module *m)
 }
 
 /**
- * v9fs_init - Initialize module
+ * init_p9 - Initialize module
  *
  */
 static int __init init_p9(void)
@@ -154,7 +154,7 @@ static int __init init_p9(void)
 }
 
 /**
- * v9fs_init - shutdown module
+ * exit_p9 - shutdown module
  *
  */