correct dgraph imports in v25 preview docs (#133)

Author: mangalaman93

dgraph/sdks/go.mdx

@@ -17,7 +17,7 @@ The client can be obtained in the usual way via `go get`:
 ```sh
  Requires at least Go 1.23
 export GO111MODULE=on
-go get -u -v github.com/dgraph-io/dgo/v210
+go get -u -v github.com/dgraph-io/dgo/v240
 ```
 
 The full [GoDoc](https://godoc.org/github.com/dgraph-io/dgo) contains

dgraph/v25-preview.mdx

@@ -14,10 +14,10 @@ releases available for use on Hypermode and locally. The fastest way to get
 started is to sign up for a free
 [Hypermode account](https://hypermode.com/login).
 
-The run locally, use the Docker image `dgraph/standalone:v25.0.0-preview3`.
+The run locally, use the Docker image `dgraph/standalone:v25.0.0-preview4`.
 
 ```bash
-docker run --rm -it -p 8080:8080 -p 9080:9080 dgraph/standalone:v25.0.0-preview3
+docker run --rm -it -p 8080:8080 -p 9080:9080 dgraph/standalone:v25.0.0-preview4
 ```
 
 ## Features
@@ -291,14 +291,19 @@ To get the query response in RDF format instead of JSON format, use the
 following `TxnOption`.
 
 ```go
+import (
+  "github.com/dgraph-io/dgo/v250"
+  "github.com/dgraph-io/dgo/v250/protos/api_v2"
+)
+
 queryDQL := `{
   alice(func: eq(name, "Alice")) {
     name
     email
     age
   }
 }`
-resp, err = client.RunDQL(context.TODO(), dgo.RootNamespace, queryDQL, dgo.WithResponseFormat(api_v25.RespFormat_RDF))
+resp, err = client.RunDQL(context.TODO(), dgo.RootNamespace, queryDQL, dgo.WithResponseFormat(api_v2.RespFormat_RDF))
 // handle error
 fmt.Printf("%s\n", resp.QueryResult)
 ```