Merge pull request OpenDDS#4494 from sonndinh/configure

Update the usage message in the configure script

configure

@@ -309,7 +309,7 @@ Options for this script are listed below, with the default behavior described
 in parenthesis after the option description.
 Boolean options can take the form "--opt" or "--no-opt", the more commonly
 needed one (the one that changes the default behavior) is shown below.
-Options that require arguments are shown as "--opt=VAL"  Options with optional
+Options that require arguments are shown as "--opt=VAL".  Options with optional
 arguments are shown as "--opt[=VAL]".  Options that can be repeated with
 cumulative effect are shown with a trailing "...".  Some third-party
 optional dependencies can be automatically located if they are installed in the