Remove incorrect mention of dropdowns for dynamic tab behavior (#32634)
Remove incorrect mention of dropdowns for dynamic tab behavior (#32634)

While technically it still works, we're already saying authors shouldn't do it later on, and we removed any examples of this. This was a straggler.

Co-authored-by: XhmikosR <b60f67e10123951b393d9ba15dcf79efc14744bb@gmail.com>
tjkohli/bootstrap,twbs/bootstrap,inway/bootstrap,m5o/bootstrap,inway/bootstrap,inway/bootstrap,GerHobbelt/bootstrap,coliff/bootstrap,twbs/bootstrap,GerHobbelt/bootstrap,m5o/bootstrap,tjkohli/bootstrap,GerHobbelt/bootstrap,coliff/bootstrap