Document tooltip/popover methods

Created by: Johann-S

Due to my bad english I prefer to open an issue. For tooltip and popover we have a lack of documentation for enable(), disable() and toggleEnabled()

X-Ref : https://github.com/twbs/bootstrap/issues/22162#issuecomment-286187379

For example (but maybe it's to light) :

.tooltip('enable')

Enable an element's tooltip.

$('#element').tooltip('enable')

.tooltip('disable')

Disable an element's tooltip.

$('#element').tooltip('disable')

.tooltip('toggleEnabled')

Allow to enable or disable an element's tooltip.

$('#element').tooltip('toggleEnabled')