doc: Update release notes for v2.0 release

Update the target version of the repositories. And the current versions
for the EWAOL build.

Clarify the sections of the v1.0 release as well.

Update the version of the Autoware submodule to match the version of the
other Autoware repositories that this project depends on.

Signed-off-by: Ambroise Vincent <ambroise.vincent@arm.com>