Remote user-facing changes section (#3248)

It was a copy-paste from Kubernetes, which we never used. As of today, to compose release messages, we use GitHub mechanism that uses PR titles and commits.

Signed-off-by: Maksim Nabokikh <maksim.nabokikh@flant.com>

.github/PULL_REQUEST_TEMPLATE.md

@@ -21,15 +21,3 @@ Thank you for sending a pull request! Here are some tips for contributors:
 -->
 
 #### Special notes for your reviewer
-
-#### Does this PR introduce a user-facing change?
-
-<!--
-If no, just write "NONE" in the release-note block below.
-If yes, a release note is required:
-Enter your extended release note in the block below. If the PR requires additional action from users switching to the new release, include the string "action required".
--->
-
-```release-note
-
-```