[PLUGINS][AttachmentShowRelated] Replacing h2 with span, its supposed to be complementary content, not main

plugins/AttachmentShowRelated/templates/attachmentShowRelated/attachmentRelatedNotes.html.twig

@@ -2,9 +2,9 @@
 
 <section class="frame-section frame-section-padding">
     <div class="section-title">
-        <h2 class="heading-no-margin">
+        <span class="heading-no-margin">
             {{ 'Notes related' | trans }}
-        </h2>
+        </span>
     </div>
 
     {% for note in related_notes %}

plugins/AttachmentShowRelated/templates/attachmentShowRelated/attachmentRelatedTags.html.twig

@@ -1,8 +1,8 @@
 <section class="frame-section frame-section-padding">
     <div class="section-title">
-        <h2 class="heading-no-margin">
+        <span class="heading-no-margin">
             {{ 'Attachment tags' | trans }}
-        </h2>
+        </span>
     </div>
 
     {% for tag in related_tags %}