Update keysend docs + add payment secret requirement for MPP#1038

Merged

TheBlueMatt merged 2 commits intolightningdevkit:mainfrom

valentinewallace:2021-08-keysend-docs

Aug 10, 2021

Commits on Aug 8, 2021

Update keysend docs
valentinewallace
committed

Commits on Aug 10, 2021

Add requirement of payment secret for multi path payments
valentinewallace
committed