Clarify release note pivot events

[devcircus]

Issue

In the release notes section, Intermediate Table/Pivot Model Events, the wording was the source of some confusion. An issue was posted on the laravel/framework repo which stated that the user expected there to be new 'syncing', 'detaching', and 'attaching' events available in Laravel 5.8.

Before

In previous versions of Laravel, Eloquent model events were not dispatched when attaching, detaching, or syncing custom intermediate table / "pivot" models of a many-to-many relationship. When using custom intermediate table models in Laravel 5.8, these events will now be dispatched.

Changes

• A documentation link was added to the reference to "Eloquent model events", to clarify which events will be dispatched.
• The phrase "these events will now be dispatched" is changed to "the applicable model events will now be dispatched.".

Hopefully these small changes will help clarify this new functionality.