fix typo. Patch by Elias Pipping

[[Imported from SVN: r6500]]

bin/dunecontrol

@@ -453,7 +453,7 @@ usage () {
     echo "      --opts=FILE    load default options from FILE"
     echo "                     (see dune-common/doc/example.opts)"
     echo "      --builddir=NAME make out-of-source builds in a subdir NAME."
-    echo "                     This directory is create inside each module."
+    echo "                     This directory is created inside each module."
     echo "      --[COMMAND]-opts=opts   set options for COMMAND"
     echo "                     (this is mainly useful for the all COMMAND)"
     echo "COMMANDS:"