ICU-22921 Update PR template

See #3285

.github/pull_request_template.md

@@ -1,25 +1,24 @@
 TODO: Please describe your changes here.
 
-TODO: Delete the following lines but _keep and fill out_ (!) the checklist below.
+TODO: Please read the following on ICU Contributing, and then delete these instructions.
 
-Thank you for your pull request!\
-General info on contributing: Please see https://github.com/unicode-org/icu/blob/main/CONTRIBUTING.md
+Thank you for your pull request! 
 
-Contributors license agreement (CLA):
-- You will be automatically asked to sign the CLA before the PR is accepted.
-- To sign the CLA: https://cla-assistant.io/unicode-org/icu
+* For general info on contributing: https://github.com/unicode-org/icu/blob/main/CONTRIBUTING.md
+* Associating PRs with Jira issues
+  - We require each pull request to be associated with a [Jira issue](https://icu.unicode.org/bugs).
+  - Reuse existing issues for minor changes:
+    * ICU 77 docs minor fixes: ICU-22921 — User Guide & API docs typos etc., and version updates (e.g., dependabot for User Guide)
+    * ICU 77 code warnings/version updates: ICU-22920 — Fix compiler warnings. Update versions of code-related dependencies (e.g., dependabot).
+* Contributors license agreement (CLA):
+  - You will be automatically asked to sign the CLA before the PR is accepted.
+  - To sign the CLA: https://cla-assistant.io/unicode-org/icu
+  - For terms of use and license, see https://www.unicode.org/terms_of_use.html
 
-For terms of use and license, see https://www.unicode.org/terms_of_use.html
-
-TODO: We require each pull request to be associated with a Jira issue.
-- For minor changes you can use one of the following per-release tickets:
-- ICU 77 code warnings/version updates: ICU-22920 — Fix compiler warnings. Update versions of code-related dependencies (e.g., dependabot).
-- ICU 77 docs minor fixes: ICU-22921 — User Guide & API docs typos etc., and version updates (e.g., dependabot for User Guide)
-
-TODO: End of lines to delete.
+TODO: Fill out the checklist below.
 
 #### Checklist
-- [ ] Required: Issue filed: https://unicode-org.atlassian.net/browse/ICU-NNNNN
+- [ ] Required: Issue filed: ICU-NNNNN
 - [ ] Required: The PR title must be prefixed with a JIRA Issue number. Example: "ICU-1234 Fix xyz"
 - [ ] Required: The PR description must include the link to the Jira Issue, for example by completing the URL in the first checklist item
 - [ ] Required: Each commit message must be prefixed with a JIRA Issue number. Example: "ICU-1234 Fix xyz"