book/ SUMMARY: move up anon assets section

doc/src/SUMMARY.md

@@ -5,9 +5,9 @@
 - [Development](development.md)
 - [Architecture](architecture/architecture.md)
   - [Overview](architecture/overview.md)
+  - [Anonymous Assets](architecture/anonymous_assets.md)
   - [Blockchain](architecture/blockchain.md)
   - [DNA](architecture/dna.md)
-  - [Anonymous Assets](architecture/anonymous_assets.md)
 - [Client](clients/clients.md)
   - [darkfid JSON-RPC API](clients/darkfid_jsonrpc.md)
   - [cashierd JSON-RPC API](clients/cashierd_jsonrpc.md)