Removed a broken reference
Removed a broken reference

https://www.w3schools.com/tags/tryit.asp?filename=tryhtml_hr_size
this link is broken, I think we perhaps should remove it?
inway/bootstrap,coliff/bootstrap,tjkohli/bootstrap,inway/bootstrap,GerHobbelt/bootstrap,twbs/bootstrap,tjkohli/bootstrap,m5o/bootstrap,coliff/bootstrap,GerHobbelt/bootstrap,twbs/bootstrap,m5o/bootstrap,inway/bootstrap,GerHobbelt/bootstrap