Add security-4703 release notes to GHES versions (#25803)

Author: ACyphus

data/release-notes/enterprise-server/3-1/18.yml

@@ -1,5 +1,7 @@
 date: '2022-03-01'
 sections:
+  security_fixes:
+    - "HIGH: An integer overflow vulnerability was identified in GitHub's markdown parser that could potentially lead to information leaks and RCE. This vulnerability was reported through the GitHub Bug Bounty program by Felix Wilhelm of Google's Project Zero and has been assigned CVE-2022-24724."
   bugs:
     - Upgrades could sometimes fail if a high-availability replica's clock was out of sync with the primary. 
     - OAuth Applications created after September 1st, 2020 were not able to use the [Check an Authorization](https://docs.github.com/en/enterprise-server@3.1/rest/reference/apps#check-an-authorization) API endpoint. 

data/release-notes/enterprise-server/3-2/10.yml

@@ -1,5 +1,7 @@
 date: '2022-03-01'
 sections:
+  security_fixes:
+    - "HIGH: An integer overflow vulnerability was identified in GitHub's markdown parser that could potentially lead to information leaks and RCE. This vulnerability was reported through the GitHub Bug Bounty program by Felix Wilhelm of Google's Project Zero and has been assigned CVE-2022-24724."
   bugs:
     - Upgrades could sometimes fail if a high-availability replica's clock was out of sync with the primary. 
     - OAuth Applications created after September 1st, 2020 were not able to use the [Check an Authorization](https://docs.github.com/en/enterprise-server@3.2/rest/reference/apps#check-an-authorization) API endpoint. 

data/release-notes/enterprise-server/3-3/5.yml

@@ -1,5 +1,7 @@
 date: '2022-03-01'
 sections:
+  security_fixes:
+    - "HIGH: An integer overflow vulnerability was identified in GitHub's markdown parser that could potentially lead to information leaks and RCE. This vulnerability was reported through the GitHub Bug Bounty program by Felix Wilhelm of Google's Project Zero and has been assigned CVE-2022-24724."
   bugs:
     - Upgrades could sometimes fail if a high-availability replica's clock was out of sync with the primary. 
     - OAuth Applications created after September 1st, 2020 were not able to use the [Check an Authorization](https://docs.github.com/en/enterprise-server@3.3/rest/reference/apps#check-an-authorization) API endpoint.