changing introductory copy to be more flexible/inclusive to all problem states

apps/openassessment/templates/openassessmentblock/oa_base.html

@@ -23,7 +23,7 @@
             <!-- if the problem is unstarted or response hasn't been submitted -->
             <div id="openassessment__message" class="openassessment__message message">
                 <div class="message__content">
-                    <p>This problem requires that you work through 3 parts. You can begin by reading the question below and <a data-behavior="ui-scroll" href="#openassessment__response">providing your response</a>.</p>
+                    <p>This problem requires that you work through multiple parts. You can begin by reading the question below and <a data-behavior="ui-scroll" href="#openassessment__response">providing your response</a>.</p>
                 </div>
             </div>
             {% endblock %}