Fix typo in usage of mwjsduck-gen

Change-Id: Ib249c42d77059b18f8d6172599c631d5e1483c5d

diff --git a/maintenance/mwjsduck-gen b/maintenance/mwjsduck-gen
index bc10bc2..622712e 100755 (executable)
--- a/maintenance/mwjsduck-gen
+++ b/maintenance/mwjsduck-gen
@@ -6,7 +6,7 @@ then
        JSDUCK_MWVERSION="$2"
 elif [[ "$*" != "" ]]
 then
-       echo "Usage $0: [--version <mediawiki version>]"
+       echo "Usage: $0 [--version <mediawiki version>]"
        echo
        exit 1
 fi