fix documentation of payload batch request bodies

Author: larskuhtz

README.md

@@ -8,7 +8,7 @@ Build Docker image:
 docker build . -t chainweb.openapi
 ```
 
-Serve API documentation at http://localhost:8080/openapi
+Serve API documentation at http://localhost:8080/openapi/
 
 ```
 docker run --rm -p 8080:80 chainweb.openapi

chainweb.openapi.yaml

@@ -1071,7 +1071,7 @@ components:
             summary: Singleton request body
             value: [ "qx346ILpakzgbNZbE8oHqF5TZQghp-HPcV-0Ptc_n2s" ]
 
-    blockHashArray:
+    payloadHashArray:
       description: An array of block payload hashes
       content:
         application/json: