docs: add CIP47 to summary (#383)

Co-authored-by: jcstein <z@zs-MacBook-Air.local>

Author: jcstein

cips/SUMMARY.md

@@ -49,6 +49,7 @@
   - [CIP-44](./cip-044.md)
   - [CIP-45](./cip-045.md)
   - [CIP-46](./cip-046.md)
+  - [CIP-47](./cip-047.md)
 
 - [Core Devs Call notes](./notes/README.md)
   - [CDC #14](./notes/cdc-14.md)