Update pull_request_template.md (uxlfoundation#751)

Signed-off-by: Alexandra Epanchinzeva alexandra.epanchinzeva@intel.com

.github/pull_request_template.md

@@ -1,26 +1,26 @@
 ### Description 
-_Add comprehensive description of proposed changes_
+_Add a comprehensive description of proposed changes_
 
 
 Fixes # - _issue number(s) if exists_
 
-- [ ] - git commit message contains appropriate signed-off-by string _(see [CONTRIBUTING.md](https://github.com/oneapi-src/oneTBB/blob/master/CONTRIBUTING.md#pull-requests) for details)_
+- [ ] - git commit message contains an appropriate signed-off-by string _(see [CONTRIBUTING.md](https://github.com/oneapi-src/oneTBB/blob/master/CONTRIBUTING.md#pull-requests) for details)_
 
 ### Type of change
 
 _Choose one or multiple, leave empty if none of the other choices apply_
 
-_Add respective label(s) to PR if you have permissions_
+_Add a respective label(s) to PR if you have permissions_
 
-- [ ] bug fix - _change which fixes an issue_
-- [ ] new feature - _change which adds functionality_
+- [ ] bug fix - _change that fixes an issue_
+- [ ] new feature - _change that adds functionality_
 - [ ] tests - _change in tests_
 - [ ] infrastructure - _change in infrastructure and CI_
 - [ ] documentation - _documentation update_
 
 ### Tests
 
-- [ ] added - _required for new features and for some bug fixes_
+- [ ] added - _required for new features and some bug fixes_
 - [ ] not needed
 
 ### Documentation