Address some review feedback

guideforms.py

@@ -572,7 +572,7 @@ METADATA_FIELDS = [
      'category',
      'feature_type', 'intent_stage',
      'search_tags',
-     # Implementtion
+     # Implemention
      'impl_status_chrome',
      'blink_components',
      'bug_url', 'launch_bug_url',

templates/feature.html

@@ -241,7 +241,7 @@
     </section>
   </div>
 
-  <chromedash-accordion title="Feature details">
+  <chromedash-accordion title="Feature details by stage">
     <chromedash-feature-detail
       feature='{{ feature_json }}'
       process='{{ process_json }}'