Additional fix on workshop headings

Author: josenino95

_layouts/workshop.html

@@ -41,7 +41,7 @@ <h2>{{page.title}}</h2>
     <hr style="border: none; border-top: 3px solid #ddd; margin: 20px 0;">
 
     <div class="survey-links">
-        <h4>Surveys</h4>
+        <h3>Surveys</h3>
         <p>Please be sure to complete these surveys before and after the
         workshop.</p>
         <p>
@@ -58,7 +58,7 @@ <h4>Surveys</h4>
     <hr style="border: none; border-top: 3px solid #ddd; margin: 20px 0;">
 
     <div class="conduct">
-        <h4>Code of Conduct</h4>
+        <h3>Code of Conduct</h3>
         <p> Everyone who participates in Carpentries activities is required to
         conform to the Code of Conduct. This document also outlines how to
         report an incident if needed.</p>
@@ -73,15 +73,15 @@ <h4>Code of Conduct</h4>
     <hr style="border: none; border-top: 3px solid #ddd; margin: 20px 0;">
 
     <div class="schedule">
-        <h4>Schedule</h4>
+        <h3>Schedule</h3>
         <p> {{page.schedule | markdownify}}</p>
     </div>
     {% endif %}
 
     {% if page.instructions %}
     <hr style="border: none; border-top: 3px solid #ddd; margin: 20px 0;">
     <div class="instructions">
-        <h4>Workshop prep instructions:</h4>
+        <h3>Workshop prep instructions:</h3>
         <p> {{page.instructions | markdownify}}</p>
     </div>
     {% endif %}