Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.
Move out azure_loadbalancer.md to cloud provider repository
**What this PR does / why we need it**:
Move out doc to cloud provider repository.
The file 'azure_loadbalancer.md' has been moved to cloud provider repository in https://github.com/kubernetes/cloud-provider-azure/pull/23 , this PR is to remove it from upstream.
**Which issue(s) this PR fixes**
Fixes #
**Special notes for your reviewer**:
**Release note**:
```release-note
NONE
```
cc @feiskyer
781f93bc31