doc: add note about preview to PR template

MylesBorins · MylesBorins · commit 3516764dcf7e · 2020-04-27T23:41:49.000-04:00
diff --git a/.github/PULL_REQUEST_TEMPLATE.md b/.github/PULL_REQUEST_TEMPLATE.md
@@ -12,3 +12,8 @@ Please read the [Code of Conduct](https://github.com/nodejs/nodejs.dev/blob/mast
   Link to the issue that is fixed by this PR (if there is one)
   e.g. Fixes #1234, Addresses #1234, Related to #1234, etc.
 -->
+
+<!--
+  If you want to generate a preview of this PR on our staging server please
+  make a comment on the Pull-Request with the text `/preview`
+ -->
