ICU-21480 Update GitHub pull request template: JIRA issue number is needed on commit...

diff --git a/.github/pull_request_template.md b/.github/pull_request_template.md
index 9386c062b599061fa357cc264d1ed434dfbc7d0d..c8a1010feb2c6b71b55ebb5c1f86b53c1dff6419 100644 (file)
--- a/.github/pull_request_template.md
+++ b/.github/pull_request_template.md
@@ -1,18 +1,20 @@
 <!--
-Thank you for your pull request.
+Thank you for your pull request!
+
 Please see http://site.icu-project.org/processes/contribute for general
 information on contributing to ICU.
 
-You will be automatically asked to sign the contributors license before the PR is accepted.
+You will be automatically asked to sign the contributors license agreement (CLA) before the PR is accepted.
 - sign: https://cla-assistant.io/unicode-org/icu
 - license: http://www.unicode.org/copyright.html
 -->
 
 ##### Checklist
 
-- [ ] Issue filed: https://unicode-org.atlassian.net/browse/ICU-_____
-- [ ] Updated PR title and link in previous line to include Issue number
-- [ ] Issue accepted
-- [ ] Tests included
-- [ ] Documentation is changed or added
-
+- [ ] Required: Issue filed: https://unicode-org.atlassian.net/browse/ICU-_____
+- [ ] Required: The PR title must be prefixed with a JIRA Issue number. For 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. For example: "ICU-1234 Fix xyz"
+- [ ] Issue accepted (done by Technical Committee after discussion)
+- [ ] Tests included, if applicable
+- [ ] API docs and/or User Guide docs changed or added, if applicable