Issue Summary

Using Repository hook document states that: Pre receive hooks allow you to control which commits go into your repository before pushes are committed or pull requests are merged. 
This seems to be misleading as the pre-receive hooks are not triggered during pull request merge operation

Steps to Reproduce

Using Repository hook document provides incorrect trigger criteria for pre-receive hook

Expected Results

The trigger criteria for pre-receive hook should include the detail about the push operation

Actual Results

The current documentation states:
Pre receive hooks allow you to control which commits go into your repository before pushes are committed or pull requests are merged. 

Workaround

Currently there is no known workaround for this behavior. A workaround will be added here when available