Fix documentation link (#837)

Author: karthikraobr

README.md

@@ -20,7 +20,7 @@ go get go.uber.org/cadence
 
 See [samples](https://github.com/uber-common/cadence-samples) to get started. 
 
-Documentation is available [here](https://cadenceworkflow.io/docs/03_goclient/). 
+Documentation is available [here](https://cadenceworkflow.io/docs/07_goclient/). 
 You can also find the API documentation [here](https://godoc.org/go.uber.org/cadence).
 
 ## Contributing