Fix #12563: Elaborate that popover('show') checks title/content #14716
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Fixes #12563: Explain in Popover docs that the
show
method will check to see if the element's title or content exists before displaying.This seemed like the only logical place for it since it should only happen if the
show
method is invokved.Another possible place is in the
content
section under Options, but it didn't seem right to explain here that the function would execute twice ifshow
is invoked and the title doesn't exist.