Make -Werr be -Wlevel, keeping it in sync with mandoc.1. Noted by

Alexander Schrijver---thanks!

1 files changed, 1 insertions, 1 deletions

diff --git a/main.c b/main.c
index 857201ba..d5e57bec 100644
--- a/main.c
+++ b/main.c
@@ -165,7 +165,7 @@ usage(void)
 			"[-mformat] "
 			"[-Ooption] "
 			"[-Toutput] "
-			"[-Werr] "
+			"[-Wlevel] "
 			"[file...]\n", 
 			progname);