Add documentation examples for left join and right join

[vc019]

Hi,

I have recently started exploring frameless and trying to figure out joins. Especially left and right joins. Would it be possible to add additional examples in the documentation? It would really make it helpful. I can currently only find examples for inner joins.

Thanks

Vic

[vc019]

I have found the issue which I hit which made me raise this request - Issue #168. I was also hitting the same issue and hence the reason to look at the documentation.