Fix javadoc for module "flowcontrol".

See #396.

Author: dr0i

metafacture-flowcontrol/src/main/java/org/metafacture/flowcontrol/StreamBuffer.java

@@ -80,6 +80,9 @@ public void replay() {
         }
     }
 
+    /**
+     * Clears the buffer.
+     */
     public void clear() {
         typeBuffer.clear();
         valueBuffer.clear();