Update floating-labels.md (#32139)
Update floating-labels.md (#32139)

Fixed grammar error.
m5o/bootstrap,tjkohli/bootstrap,coliff/bootstrap,tjkohli/bootstrap,GerHobbelt/bootstrap,twbs/bootstrap,coliff/bootstrap,twbs/bootstrap,m5o/bootstrap,inway/bootstrap,inway/bootstrap,GerHobbelt/bootstrap,inway/bootstrap,GerHobbelt/bootstrap