I've added a bit more explanation

https://github.com/novaspivack/lace/blob/master/Rule_Explana...

https://github.com/novaspivack/lace/blob/master/Betweenness_...

These cover only one metric and one rule, but give some more info

Here is a more detailed explanation: https://github.com/novaspivack/lace/blob/master/Realm_of_Lac...