Remove references to extended support (#57420)

Author: pallsama

content/admin/all-releases.md

@@ -23,7 +23,7 @@ For information about the latest release, see the [{% data variables.product.pro
 | Version | Candidate | Release | {% data variables.release-phases.closing_down_caps %} date | Supported | Release notes | Docs |
 | :- | :- | :- | :- | :-: | :- | :- |
 {%- for version in enterpriseServerReleases.supported %}
-| {{version}} | {{enterpriseServerReleases.dates[version].displayCandidateDate}} | {{enterpriseServerReleases.dates[version].displayReleaseDate}} | Support temporarily extended until further notice | {% octicon "check" aria-label="Supported" %} | [{{version}} release notes](/enterprise-server@{{version}}/admin/release-notes) | [{{version}} docs](/enterprise-server@{{version}}) |
+| {{version}} | {{enterpriseServerReleases.dates[version].displayCandidateDate}} | {{enterpriseServerReleases.dates[version].displayReleaseDate}} | {{enterpriseServerReleases.dates[version].deprecationDate}} | {% if currentDate < deprecationDate %}{% octicon "check" aria-label="Supported" %}{% else %}{% octicon "x" aria-label="Not supported" %}{% endif %} | [{{version}} release notes](/enterprise-server@{{version}}/admin/release-notes) | [{{version}} docs](/enterprise-server@{{version}}) |
 {%- endfor %}
 {%- for version in enterpriseServerReleases.deprecatedReleasesWithNewFormat %}
 {%- assign candidateDisplay = enterpriseServerReleases.dates[version].displayCandidateDate | default: enterpriseServerReleases.dates[version].releaseDate %}

content/admin/upgrading-your-instance/troubleshooting-upgrades/known-issues-with-upgrades-to-your-instance.md

@@ -25,7 +25,7 @@ redirect_from:
 
 We have lifted the pause on upgrades to versions 3.15, 3.16, and 3.17. You can now upgrade to 3.15.12, 3.16.8, 3.17.5, or later. We do not recommend upgrading to earlier releases of 3.15, 3.16, or 3.17. As an additional step, it is recommended to check system capacity before upgrading. See [AUTOTITLE](/admin/upgrading-your-instance/preparing-to-upgrade/check-system-capacity-before-upgrading).
 
-We are extending the support window for versions 3.14, 3.15, 3.16, and 3.17. The support window for 3.13 remains unchanged. The closing down date for each of 3.14, 3.15, 3.16, and 3.17 has been updated to "Support temporarily extended until further notice". For more information, see [AUTOTITLE](/admin/all-releases#releases-of-github-enterprise-server).
+We have extended the support window for versions 3.14, 3.15, 3.16, and 3.17. The support window for 3.13 remains unchanged. The closing down date for each of 3.14, 3.15, 3.16, and 3.17 has been updated. For more information, see [AUTOTITLE](/admin/all-releases#releases-of-github-enterprise-server).
 
 We will continue to release patches for 3.14, 3.15, 3.16, and 3.17 throughout this extended support window.