fix(dev): fix missing closing parenthesis in reference.rst template examples

{{ t('myapp', 'Title' }} and {{ t('myapp', 'Extra info' }} were both
missing the closing ) before }}.

AI-Assisted-By: claude-sonnet-4-6 <noreply@anthropic.com>
Signed-off-by: Anna Larch <anna@nextcloud.com>

Author: miaulalala

developer_manual/digging_deeper/reference.rst

@@ -658,15 +658,15 @@ in a custom fashion:
         <div v-if="richObject">
             <div>
                 <label>
-                    {{ t('myapp', 'Title' }}
+                    {{ t('myapp', 'Title') }}
                 </label>
                 <span>
                     {{ richObject.title }}
                 </span>
             <div>
             <div>
                 <label>
-                    {{ t('myapp', 'Extra info' }}
+                    {{ t('myapp', 'Extra info') }}
                 </label>
                 <span>
                     {{ richObject.extra_info }}