DOC Add missing info and fix linting issues

en/08_Changelogs/rc/5.2.0-rc1.md

@@ -110,8 +110,7 @@ A full list of module versions included in CMS Recipe 5.2.0-rc1 is provided belo
 
 </details>
 
-
-## Release Candidate
+## Release candidate
 
 This version of Silverstripe CMS is a **release candidate** for an upcoming stable version, and should not be applied to production websites. We encourage developers to test this version in development / testing environments and [report any issues they encounter via GitHub](/contributing/issues_and_bugs/).
 
@@ -128,6 +127,12 @@ We have provided a severity rating of the vulnerabilities below based on the CVS
 - [CVE-2023-48714 - Record titles for restricted records can be viewed if exposed by GridFieldAddExistingAutocompleter](https://www.silverstripe.org/download/security-releases/cve-2023-48714) Severity: Medium
 - [CVE-2023-44401 - View permissions are bypassed for paginated lists of ORM data in GraphQL queries](https://www.silverstripe.org/download/security-releases/cve-2023-44401) Severity: Medium
 
+## PHP 8.3 support {#php-83}
+
+This release includes official support for PHP 8.3 for all supported modules. There were only very minor code changes required to add this support, so your upgrades should be fairly straightforward in that regard.
+
+Check out the [PHP 8.3 release announcement](https://www.php.net/releases/8.3/en.php) to see what's new and what's changed.
+
 ## Official support for `silverstripe/linkfield` {#linkfield}
 
 [`silverstripe/linkfield`](https://github.com/silverstripe/silverstripe-linkfield) 4.0.0-rc1 has been released and will become a commercially supported module.