Outdated/Missing documentation for onChange event

[sischnei]

I'm upgrading from Ace 1.1.9 to 1.4.12 and I noticed that there have been changes to the onChange event API. I think this was part of the following ticket: #1745

However, the API documentation on the website (https://ace.c9.io/#nav=api&api=editor) still shows the old API calls and there isn't really a good source pointing to the above ticket (which contains helpful information).

[nightwing]

This was fixed by #4900 https://ajaxorg.github.io/ace-api-docs/interfaces/Ace.Delta.html