doc: Add PR review guidelines to template

templates/pr-description.md

@@ -2,6 +2,19 @@
 
 <!-- One sentence: goal of this session and source processed. -->
 
+<!--
+REVIEW GUIDELINES (write the guideline as the FIRST word of your review):
+  REWORK:  <what to fix>     -> same branch, guided retry
+  RESTART: <why restart>    -> close PR, start over from scratch
+  SPLIT:   <how to split>       -> close PR, reopen as separate branches
+  REJECT:  <why not>           -> close PR, no retry
+  MERGE                          -> approve and merge
+Rules: one concern per directive; be specific to lines/pages; name the principle
+that was violated; describe the DESIRED STATE; avoid saying “do better.”
+-->
+
+Translated with DeepL.com (free version)
+
 ## Pages Created
 
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