[MERGE] Better hooks doc

[John Arbash Meinel]

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Ian Clatworthy wrote:
| This patch fixes a doco bug introduced by the recent install_named_hook
| patch and updates the User Reference to be more comprehensive. In
| particular, it now documents Jelmer's start_commit hook and the
| server_started/server_stopped hooks.
|
| Ian C.
|

BB:approve

I might recommend taking a piece of PEP8 and putting 2 blank spaces before
section headings. Certainly not required, but I find it makes reading the texts
easier.

John
=:->

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