Update enhancement.md

Add a note about not sharing sensitive info on this public repo.

Author: GaryJones

.github/ISSUE_TEMPLATE/enhancement.md

@@ -4,6 +4,8 @@ about: Suggest an improvement for this project
 
 ---
 
+<!-- ATTENTION: :wave: Just a quick reminder that this is a public repo. Please don't include any internal links or sensitive data (like PII, private code, client names, site URLs, etc. If you're not sure if something is safe to share, please just ask! -->
+
 <!-- Before requesting this, consider if this really is VIP-specific, or whether the improvement would benefit everyone, via the WordPress Coding Standards: https://github.com/WordPress-Coding-Standards/WordPress-Coding-Standards/issues/new -->
 
 ## What problem would the enhancement address for VIP?