Add release notes for OS versions

Signed-off-by: Jane Sandberg <js7389@princeton.edu>

diff --git a/docs/RELEASE_NOTES_NEXT/Architecture/os_requirements.adoc b/docs/RELEASE_NOTES_NEXT/Architecture/os_requirements.adoc
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+== Operating System Requirements ==
+
+Evergreen 3.10 now supports installation on Ubuntu 22.04 (Jammy Jellyfish).
+
+This release removes support for Debian Stretch and Ubuntu 18.04 (Bionic Beaver).