properties -> system properties (as suggested by Knut Wannheden).

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@272569 13f79535-47bb-0310-9956-ffa450edef68

docs/manual/running.html

@@ -127,7 +127,7 @@ set):</p>
   to invoke a different JVM than <code>JAVA_HOME/bin/java(.exe)</code>.</li>
 
   <li><code>ANT_OPTS</code> - command-line arguments that should be
-  passed to the JVM. For example, you can define properties or set
+  passed to the JVM. For example, you can define system properties or set
   the maximum Java heap size here.</li>
 
   <li><code>ANT_ARGS</code> - Ant command-line arguments. For example,