Update 3.3 release candidate notes using generated release_noter parts

Standardize the whole page template using release_noter's new template.
The latter is partially based on practices from previous release notes,
with improvements starting here.

Do the manual, non-noteworthy content removal through the follow-up
change I8abba57a. The latter has other content removed in its scope.

Bug: Issue 13483
Change-Id: I3fbb01586ab5f81bb0af1fe01d11b6ee4cb7b643
1 file changed