add to index and fix whitespace
@@ -23,6 +23,7 @@ Flow is a new blockchain for open worlds. Read more about it [here](https://gith
- [Single party, single signature](#single-party-single-signature)
- [Single party, multiple signatures](#single-party-multiple-signatures)
- [Multiple parties](#multiple-parties)
+ - [Multiple parties, two autorizers](#multiple-parties-two-autorizers)
- [Multiple parties, multiple signatures](#multiple-parties-multiple-signatures)
- [Sending a Transaction](#sending-a-transaction)
- [Querying Transaction Results](#querying-transaction-results)
