chore: rename block to districts-content (plural) for consistency

Author: lalver1

pems/districts/templates/districts/district.html

@@ -4,7 +4,7 @@
     District {{ district_number }} - {{ district.name }}
 {% endblock headline %}
 
-{% block district-content %}
+{% block districts-content %}
     <div class="row">
         <div class="col-lg-4 border">
             <h2>Form</h2>
@@ -21,4 +21,4 @@ <h2>Details for {{ district.name }}</h2>
             <h2>Map</h2>
         </div>
     </div>
-{% endblock district-content %}
+{% endblock districts-content %}

pems/districts/templates/districts/index.html

@@ -21,7 +21,7 @@
             </div>
             <div class="col-lg-10 pb-lg-5">
 
-                {% block district-content %}
+                {% block districts-content %}
                     <div class="row">
                         <div class="col-lg-4 border">
                             <h2>Form</h2>
@@ -38,7 +38,7 @@ <h2>Details</h2>
                             <h2>Map</h2>
                         </div>
                     </div>
-                {% endblock district-content %}
+                {% endblock districts-content %}
 
             </div>
         </div>