reference other more recent source regarding the IE viewport bug
docs: sort tooltip & container options for sanity
add 'viewport' option to popover docs; #12328 erratum
add multiple triggers info to popover docs
add 'selector' option motivation to tooltip docs
add 'container' option motivation to tooltip docs
update default 'template' value in popover docs
Merge pull request #13601 from twbs/tooltip-popover-doc

Sync tooltip & popover docs