Use scrollspy in docs ToC

Created by: JamesPierce82

Hello,

I was recently browsing the BootStrap 4 docs and found that the scrollspy example does not appear to work in the docs. I remember seeing it work properly in the docs for Bootstrap 3 so was surprised to see it no longer working in the BS4 docs.

As I usually look to the docs for my examples, I hope this issue is able to be resolved.

Thanks in advance for any assistance.

James