Clarify request to list third-party limits in PR template

.github/pull_request_template.md

@@ -47,7 +47,7 @@ restrictions.
   * [ ] We are listing *any* third-party limits that we seek to work around in our rationale such as those between IOS 14.5+ and Facebook (see [Issue #1245](https://github.com/publicsuffix/list/issues/1245) as a well-documented example)
     - [Cloudflare](https://developers.cloudflare.com/learning-paths/get-started/add-domain-to-cf/add-site/)
     - [Letsencrypt](https://letsencrypt.org/docs/rate-limits/)
-    - <UPDATE THIS LIST WITH YOUR LIMITATIONS!>
+    - <UPDATE THIS LIST WITH YOUR LIMITATIONS! REMOVE ENTRIES WHICH DO NOT APPLY! REMOVE THIS LINE!>
 
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 The purpose of the question above is to expose limit workarounds.