update (NVIDIA#8978)

Signed-off-by: eharper <[email protected]>

.github/PULL_REQUEST_TEMPLATE.md

@@ -15,7 +15,12 @@ Add a one line overview of what this PR aims to accomplish.
 ```
 
 # Jenkins CI
-To run Jenkins, a NeMo User with write access must comment `jenkins` on the PR.
+
+The Jenkins CI system has been replaced by GitHub Actions self-hosted runners.
+
+There's no need to comment `jenkins` on the PR to trigger Jenkins CI.
+The GitHub Actions CI will run automatically when the PR is opened.
+To run CI on an untrusted fork, a NeMo user with write access must click "Approve and run".
 
 # Before your PR is "Ready for review"
 **Pre checks**: