Uncomment breaking change

Author: carsonip

release-notes/breaking-changes/elastic-apm.md

@@ -17,8 +17,8 @@ To learn how to upgrade, check out <uprade docs>.
 % **Action**<br> Steps for mitigating deprecation impact.
 % ::::
 
-% ## 9.0.0 [elastic-apm-900-breaking-changes]
-% **Release date:** March 25, 2025
+## 9.0.0 [elastic-apm-900-breaking-changes]
+**Release date:** March 25, 2025
 
 % ::::{dropdown} Title of breaking change 
 % Description of the breaking change.
@@ -27,9 +27,9 @@ To learn how to upgrade, check out <uprade docs>.
 % **Action**<br> Steps for mitigating deprecation impact.
 % ::::
 
-% ::::{dropdown} Change server information endpoint `/` to only accept GET and HEAD requests
-% This will surface any agent misconfiguration causing data to be sent to `/` instead of the correct endpoint, e.g. `/v1/traces` for OTLP/HTTP.
-% For more information, check [PR #15976](https://github.com/elastic/apm-server/pull/15976).
-% **Impact**<br> Any methods other than GET and HEAD to `/` will return HTTP 405 Method Not Allowed.
-% **Action**<br> Update any existing usage of e.g. `POST /` to `GET /`.
-% ::::
+::::{dropdown} Change server information endpoint `/` to only accept GET and HEAD requests
+This will surface any agent misconfiguration causing data to be sent to `/` instead of the correct endpoint, e.g. `/v1/traces` for OTLP/HTTP.
+For more information, check [PR #15976](https://github.com/elastic/apm-server/pull/15976).
+**Impact**<br> Any methods other than GET and HEAD to `/` will return HTTP 405 Method Not Allowed.
+**Action**<br> Update any existing usage of e.g. `POST /` to `GET /`.
+::::