update: replace ehancements freeze context wwith PRR freeze where relevant

Author: whtssub

release-team/role-handbooks/enhancements/README.md

@@ -212,13 +212,13 @@ Please contact SIG Release on Slack if there is any uncertainty regarding whethe
      - Apply filters: `PRR Status` = "Not Started" or "In Progress"
      - This will show KEPs that need PRR attention
 
-  2. **Timing**: Send notifications typically 1-2 weeks before enhancement freeze to give PRR team sufficient time to review
+  2. **Timing**: Send notifications typically 1-2 weeks before PRR freeze to give PRR team sufficient time to review
 
   3. **Template message for #prod-readiness**:
      ```
      Hi PRR team! 👋 {current release} Enhancements team here.
      
-     We're approaching enhancement freeze on **{ENHANCEMENTS_FREEZE_DATETIME}** and wanted to flag KEPs that may need PRR attention.
+     We're approaching PRR freeze on **{PRR_FREEZE_DATETIME}** and wanted to flag KEPs that may need PRR attention.
      
      Here are KEPs currently waiting for PRR reviews: [Link to filtered project board view]