[GHES 3.1] GitHub Enterprise Server GA (#19573)

* remove RC banner

* archive RC release notes

* move it all over

* add xenserver deprecation warning

* Remove the check annotations known issue as it no longer applies

* Copied in my release notes from the spreadsheet, pending a couple more

* Add security release note

* Add changes field

* Fix spokesd linter warning

* Add quotes around the second changes bullet

* update with code scanning retraction

* move bug fixes around

* npm lint changes

* more lint checks

* update with bug fix

* reorganize a bit

* update typo

* add a few more edits

* update with mobile beta filtering

* fix formatting problems

* quotes

* update to fix linting errors

* Update data/release-notes/enterprise-server/3-1/0.yml

* update with @lucascosti's amazing feedback

* move security fixes out of changes

* pull out security fixes

* typo in security section

* move security fixes down

* Add the last two known bugfixes to the bugs section

* Adding known issue and rewriting a bug fix

* Adding known issue around using ghe-repo owner/reponame

Co-authored-by: Zachary Mark <zachary-mark@github.com>
Co-authored-by: Lucas Costi <lucascosti@users.noreply.github.com>
Co-authored-by: Melanie Yarbrough <11952755+myarb@users.noreply.github.com>
Co-authored-by: Mike Surowiec <mikesurowiec@users.noreply.github.com>
Co-authored-by: Amy Burns <timeyoutakeit@github.com>

content/admin/installation/setting-up-a-github-enterprise-server-instance/installing-github-enterprise-server-on-xenserver.md

@@ -10,6 +10,13 @@ versions:
 topics:
   - Enterprise
 ---
+
+{% note %}
+
+  **Note:** Support for {% data variables.product.prodname_ghe_server %} on XenServer will be discontinued in {% data variables.product.prodname_ghe_server %} 3.3. For more information, see the [{% data variables.product.prodname_ghe_server %} 3.1 release notes](/admin/release-notes#3.1.0)
+
+{% endnote %}
+
 ### Prerequisites
 
 - {% data reusables.enterprise_installation.software-license %}