Use computed prop for help path

This avoids the help path being calculated at script execution time,
before the component has even been instantiated (which may never even
happen).

app/assets/javascripts/design_management/components/design_notes/design_reply_form.vue

@@ -2,7 +2,7 @@
 import { GlButton, GlModal } from '@gitlab/ui';
 import MarkdownField from '~/vue_shared/components/markdown/field.vue';
 import { s__ } from '~/locale';
-import { helpPagePath } from '~/lib/utils/help_page_utility';
+import { helpPagePath } from '~/helpers/help_page_helper';
 
 export default {
   name: 'DesignReplyForm',
@@ -61,6 +61,9 @@ export default {
         ? s__('DesignManagement|Comment')
         : s__('DesignManagement|Save comment');
     },
+    markdownDocsPath() {
+      return helpPagePath('user/markdown');
+    },
   },
   mounted() {
     this.focusInput();
@@ -80,9 +83,6 @@ export default {
       this.$refs.textarea.focus();
     },
   },
-  helpLinks: {
-    markdownDocsPath: helpPagePath('user/markdown'),
-  },
 };
 </script>
 
@@ -93,7 +93,7 @@ export default {
       :can-attach-file="false"
       :enable-autocomplete="true"
       :textarea-value="value"
-      :markdown-docs-path="$options.helpLinks.markdownDocsPath"
+      :markdown-docs-path="markdownDocsPath"
       class="bordered-box"
     >
       <template #textarea>