minor KnpLabs#987 Add missing repo hooks documentation (acrobat)

This PR was merged into the 2.x branch.

Discussion
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Fixes KnpLabs#791

Commits
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eec9015 Add missing repo hooks documentation

Author: acrobat

doc/repo/hooks.md

@@ -0,0 +1,46 @@
+## Repo / Hooks API
+[Back to the "Repos API"](../repos.md) | [Back to the navigation](../README.md)
+
+For extended info see the [Github documentation](https://docs.github.com/en/rest/reference/repos#webhooks)
+
+### List repository webhooks
+
+```php
+$hooks = $client->api('repo')->hooks()->all('twbs', 'bootstrap');
+```
+
+### Get a repository webhook
+
+```php
+$hook = $client->api('repo')->hooks()->show('twbs', 'bootstrap', $hookId);
+```
+
+### Create a repository webhook
+
+```php
+$client->api('repo')->hooks()->create('twbs', 'bootstrap', $parameters);
+```
+
+### Update a repository webhook
+
+```php
+$client->api('repo')->hooks()->update('twbs', 'bootstrap', $hookId, $parameters);
+```
+
+### Delete a repository webhook
+
+```php
+$client->api('repo')->hooks()->remove('twbs', 'bootstrap', $hookId);
+```
+
+### Ping a repository webhook
+
+```php
+$client->api('repo')->hooks()->ping('twbs', 'bootstrap', $hookId);
+```
+
+### Test the push repository webhook
+
+```php
+$client->api('repo')->hooks()->test('twbs', 'bootstrap', $hookId);
+```