Fix events' documentation

[Piotrek Koszuliński]

Some of them were incorrectly documented in v3 and after porting docs to JSDuck they still are.

For example:

/**
 * Internal event to perform the {@link #method-insertHtml} call.
 *
 * @event insertHtml
 * @param {CKEDITOR.editor} editor This editor instance.
 * @param {Object} data
 * @param {String} data.mode Mode in which data is inserted (see {@link #method-insertHtml}).
 * @param {String} data.dataValue The HTML to insert.
 */

/**
 * Internal event to perform the {@link #method-insertText} call.
 *
 * @event insertText
 * @param {CKEDITOR.editor} editor This editor instance.
 * @param {String} text The text to insert.
 */

/**
 * Internal event to perform the {@link #method-insertElement} call.
 *
 * @event insertElement
 * @param {CKEDITOR.editor} editor This editor instance.
 * @param {CKEDITOR.dom.element} element The element to insert.
 */

Only first event is correctly documented. Next two have broken params descriptions - there's evt.data passed in both situations, not evt.element and evt.text.

[Piotrek Koszuliński]

Fixed with ​git:526aa73.