Update wording for additional feedback on peer assessment

apps/openassessment/templates/openassessmentblock/peer/oa_peer_assessment.html

@@ -99,10 +99,10 @@
 
                                         <li class="wrapper--input field field--textarea assessment__rubric__question assessment__rubric__question--feedback" id="assessment__rubric__question--feedback">
                                             <label class="question__title" for="assessment__rubric__question--feedback__value">
-                                                <span class="question__title__copy">Please provide additional feedback for this response.</span>
+                                                <span class="question__title__copy">(Optional) What aspects of this response stood out to you? What did it do well? How could it improve?</span>
                                             </label>
                                             <div>
-                                                <textarea id="assessment__rubric__question--feedback__value" placeholder="I felt this response was..."></textarea>
+                                                <textarea id="assessment__rubric__question--feedback__value" placeholder="I noticed that this response..."></textarea>
                                             </div>
                                         </li>
                                     </ol>