Fix bullets in doc/development/i18n/externalization.md

doc/development/i18n/externalization.md

@@ -256,6 +256,7 @@ For example use `%{created_at}` in Ruby but `%{createdAt}` in JavaScript. Make s
 - In Vue:
 
   Use the [`GlSprintf`](https://gitlab-org.gitlab.io/gitlab-ui/?path=/docs/utilities-sprintf--sentence-with-link) component if:
+  
   - you need to include child components in the translation string.
   - you need to include HTML in your translation string.
   - you are using `sprintf` and need to pass `false` as the third argument to