Fix Classname of ktor client (#1134)

* Fix Classname of ktor client

* Fix URL in ktor-example

Author: huehnerlady

website/docs/client/client-serialization.mdx

@@ -366,8 +366,8 @@ graphql {
 By default, `ServiceLoader` mechanism will load the first available GraphQL client serializer from the classpath.
 
 ```kotlin
-val client = GraphQLWebClient(
-  url = "http://localhost:8080/graphql"
+val client = GraphQLKtorClient(
+  url = URL("http://localhost:8080/graphql")
   serializer = GraphQLClientKotlinxSerializer()
 )
 ```
@@ -465,8 +465,8 @@ By default, `ServiceLoader` mechanism will load the first available GraphQL clie
 also explicitly specify serializer during client construction
 
 ```kotlin
-val client = GraphQLWebClient(
-  url = "http://localhost:8080/graphql"
+val client = GraphQLKtorClient(
+  url = URL("http://localhost:8080/graphql")
   serializer = GraphQLClientJacksonSerializer()
 )
 ```