Update php-agent-12-0-0-25.mdx

Author: tejaswaroop-nr

src/content/docs/release-notes/agent-release-notes/php-release-notes/php-agent-12-0-0-25.mdx

@@ -10,10 +10,10 @@ security: []
 
 ## New Relic PHP agent v12.0.0.25
 
-### Bug Fixes
+### Bug fixes
 
 * Improve drupal hook map error logging.
-* Fix legacy package detection issues for [Security Rx](https://docs.newrelic.com/docs/vulnerability-management/overview/).
+* Fix legacy package detection issues for [Security RX](https://docs.newrelic.com/docs/vulnerability-management/overview/).
 
 ### Notice