fixup! Add section for API contract.

Author: G8XSU

README.md

@@ -58,7 +58,7 @@ demand from wallets and may slip to a later date. Refer to [LDK-Roadmap] for mor
 
 ### API
 
-For detailed API contract of VSS, you can refer to the [VSS API contract].
+See the [VSS API contract] for details.
 
 ### Implementation