docs(sample): Remove client from JsonStreamWriter in `WriteCommit…

…tedStream` (#1248)

The sample yields a `PERMISSION_DENIED` error if we pass the `client` even if the regions are compatible and the authenticated gcloud agent/service has the required permissions.

More details on:
https://issuetracker.google.com/issues/196338290

samples/snippets/src/main/java/com/example/bigquerystorage/WriteCommittedStream.java

@@ -62,7 +62,7 @@ public static void writeCommittedStream(String projectId, String datasetName, St
       // For more information about JsonStreamWriter, see:
       // https://googleapis.dev/java/google-cloud-bigquerystorage/latest/com/google/cloud/bigquery/storage/v1beta2/JsonStreamWriter.html
       try (JsonStreamWriter writer =
-          JsonStreamWriter.newBuilder(writeStream.getName(), writeStream.getTableSchema(), client)
+          JsonStreamWriter.newBuilder(writeStream.getName(), writeStream.getTableSchema())
               .build()) {
         // Append 10 JSON objects to the stream.
         for (int i = 0; i < 10; i++) {