Update the pull Request template wording (#14619)

* [WIP]Fix typo

Fix typo

* Update PULL_REQUEST_TEMPLATE.md

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,16 +1,16 @@
 >^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-> Please delete this note before submitting the pull request.
+> Remember to delete this note before submitting your pull request.
 >
-> For 1.15 Features: set Milestone to 1.15 and Base Branch to dev-1.15
+> For pull requests on 1.15 Features: set Milestone to 1.15 and Base Branch to dev-1.15
 > 
-> For Chinese localization, base branch to release-1.14
+> For pull requests on Chinese localization, set Base Branch to release-1.14
 >
-> For Korean Localization: set Base Branch to dev-1.14-ko.\<latest team milestone>
+> For pull requests on Korean Localization: set Base Branch to dev-1.14-ko.\<latest team milestone>
 >
-> Help editing and submitting pull requests:
+> If you need Help on editing and submitting pull requests, visit:
 > https://kubernetes.io/docs/contribute/start/#improve-existing-content.
 >
-> Help choosing which branch to use:
+> If you need Help on choosing which branch to use, visit:
 > https://kubernetes.io/docs/contribute/start#choose-which-git-branch-to-use.
 >^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 >