minor KnpLabs#1058 Update incorrect documentation (pheeque1)

This PR was merged into the 3.4.x-dev branch.

Discussion
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The `find` method is no longer used and has been removed in the latest version.

Commits
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3814613 Update incorrect documentation

Author: acrobat

doc/users.md

@@ -6,11 +6,7 @@ Wrap [GitHub User API](http://developer.github.com/v3/users/).
 
 ### Search for users by keyword
 
-```php
-$users = $client->api('user')->find('KnpLabs');
-```
-
-Returns an array of found users.
+Use the [Search API](https://github.com/KnpLabs/php-github-api/blob/master/doc/search.md#search-users) to find users by keyword.
 
 ### Lists all users, in the order they signed up, since the last user you've seen