Feature Discovery is missing open/close event handlers

[gselderslaghs]

The open and close event handlers are missing from the documentation within the "Initialization" section, this results in non-interactive buttons when applied in a working example

Please refer to issue #523 [Bug]: Feature Discovery TapTarget component not working as described for more information

[gselderslaghs]

This more seemed to be a bug as described in #523 comment as the component is working correctly as described in docs after applying bugfix from pull-request #537

Still, the documentation is lacking advise about how Feature Discovery can be opened with an additional trigger (eg. in-page link), should I update the documentation accordingly?