add PR template details for docs

.github/PULL_REQUEST_TEMPLATE.md

@@ -3,5 +3,6 @@
 - [ ] The code has been formatted properly using `go fmt ./...`.
 - [ ] All [static analysis checks](https://github.com/jfrog/jfrog-cli-security/actions/workflows/analysis.yml) passed.
 - [ ] All [tests](https://github.com/jfrog/jfrog-cli-security/actions/workflows/test.yml) have passed. If this feature is not already covered by the tests, new tests have been added.
+- [ ] All changes are detailed at the description. if not already covered at [JFrog Documentation](https://github.com/jfrog/documentation), new documentation have been added.
 
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