Update PR template (#1914)

Co-authored-by: emily.chun <chuneuny@ikvensx012>

Author: chuneuny-emily

.github/pull_request_template.md

@@ -22,17 +22,18 @@ not fully covered by unit tests or manual testing can be complicated. -->
 
 <!-- Put an 'x' in all the boxes that apply -->
 
-- [ ] I submit my changes into the `develop` branch
-- [ ] I have added description of my changes into [CHANGELOG](https://github.com/openvinotoolkit/training_extensions/blob/develop/CHANGELOG.md)
-- [ ] I have updated the [documentation](https://github.com/openvinotoolkit/training_extensions/tree/develop/docs) accordingly
-- [ ] I have added tests to cover my changes
-- [ ] I have [linked related issues](https://help.github.com/en/github/managing-your-work-on-github/linking-a-pull-request-to-an-issue#linking-a-pull-request-to-an-issue-using-a-keyword)
+- [ ] I have added unit tests to cover my changes.​
+- [ ] I have added integration tests to cover my changes.​
+- [ ] I have added e2e tests for validation.
+- [ ] I have added the description of my changes into CHANGELOG in my target branch. (e.g., [CHANGELOG](https://github.com/openvinotoolkit/training_extensions/blob/develop/CHANGELOG.md) in develop)​
+- [ ] I have updated the documentation in my target branch accordingly. (e.g., [documentation](https://github.com/openvinotoolkit/training_extensions/tree/develop/docs) in develop)
+- [ ] I have [linked related issues](https://help.github.com/en/github/managing-your-work-on-github/linking-a-pull-request-to-an-issue#linking-a-pull-request-to-an-issue-using-a-keyword).
 
 ### License
 
 - [ ] I submit _my code changes_ under the same [MIT License](https://github.com/openvinotoolkit/training_extensions/blob/develop/LICENSE) that covers the project.
       Feel free to contact the maintainers if that's a concern.
-- [ ] I have updated the license header for each file (see an example below)
+- [ ] I have updated the license header for each file. (see an example below)
 
 ```python
 # Copyright (C) 2023 Intel Corporation