Remove Issue events from /activity/events/

The [Activity Event documentation](http://developer.github.com/v3/activity/events) says:

    All Events have the same response format

This is true for all Event endpoint **except one**:

    GET /repos/:owner/:repo/issues/events

In fact, this endpoint returns the following fields: `id` (integer), `actor`, `commit_id`, `created_at`, `event`, `issue`, `url`, while all the other endpoints return the following fields: `id` (string), `type`, `actor`, `repo`, `payload`, `public`, `created_at`, .

To avoid confusion, I suggest to *remove* the endpoint `GET /repos/:owner/:repo/issues/events` from the Activity/Events documentation page. Indeed, [this exact same endpoint is already documented in a different section](http://developer.github.com/v3/issues/events/#list-events-for-a-repository). Removing it from this page would make the initial statement true:

    All Events have the same response format