Move experimental heading at the bottom under changelog

doc/administration/high_availability/redis.md

@@ -21,7 +21,6 @@ that comes bundled with Omnibus GitLab packages.
 - [High Availability with Sentinel](#high-availability-with-sentinel)
     - [Prerequisites](#prerequisites)
     - [Redis setup](#redis-setup)
-  - [Experimental Redis Sentinel support](#experimental-redis-sentinel-support)
     - [Sentinel setup](#sentinel-setup)
     - [Recommended setup](#recommended-setup)
 - [Configuring instances using Omnibus](#configuring-instances-using-omnibus)
@@ -41,6 +40,8 @@ that comes bundled with Omnibus GitLab packages.
     - [Redis replication](#redis-replication)
     - [Sentinel](#sentinel)
         - [Omnibus GitLab](#omnibus-gitlab)
+- [Changelog](#changelog)
+    - [Experimental Redis Sentinel support](#experimental-redis-sentinel-support)
 
 <!-- END doctoc generated TOC please keep comment here to allow auto update -->
 
@@ -160,13 +161,6 @@ a failover, as the nodes will be managed by the Sentinels, and even after a
 `gitlab-ctl reconfigure`, they will get their configuration restored by
 the same Sentinels.
 
-### Experimental Redis Sentinel support
-
-   > Experimental Redis Sentinel support was [Introduced][ce-1877] in GitLab 8.11.
-     Starting with 8.14, Redis Sentinel is no longer experimental.
-     If you used with versions `< 8.14` before, please check the updated
-     documentation here.
-
 ### Sentinel setup
 
 Sentinels watches both other sentinels and Redis nodes. Whenever a Sentinel
@@ -815,6 +809,19 @@ To make sure your configuration is correct:
     You should see a different port after a few seconds delay
     (the failover/reconnect time).
 
+
+## Changelog
+
+Changes to Redis HA over time.
+
+### Experimental Redis Sentinel support
+
+>
+Experimental Redis Sentinel support was [Introduced][ce-1877] in GitLab 8.11.
+Starting with 8.14, Redis Sentinel is no longer experimental.
+If you used with versions `< 8.14` before, please check the updated
+documentation here.
+
 ---
 
 Read more on high-availability configuration: