Revert "Add documentation for hideSelectionFromResult"

This reverts commit 916bb14414f2acc1dbb64b56fe7c9ada601fdc40.

New problems found in:
https://github.com/ivaynberg/select2/issues/2196

Original issue:
https://github.com/ivaynberg/select2/issues/1538

Pull request:
https://github.com/ivaynberg/select2/pull/2032