Specify member type (GoogleCloudPlatform#3602)

Saying "member:user@example.com" isn't helpful, since the prefix needs to be "user", "serviceAccount", or "group", not "member'" Since this is a quickstart, we should just pick one type and stick with that. "user" is a good way to demonstrate core functionality, so I picked that type. lesv: using ADMIN to push as the bug is somewhere else. See GoogleCloudPlatform#3605 for tracking issue

Author: melaniedejong

iam/api-client/src/main/java/iam/snippets/QuickstartV2.java

@@ -36,7 +36,7 @@ public class QuickstartV2 {
  public static void main(String[] args) {
  // TODO: Replace with your project ID.
  String projectId = "your-project";
- // TODO: Replace with the ID of your member in the form "member:user@example.com"
+ // TODO: Replace with the ID of your member in the form "user:member@example.com"
  String member = "your-member";
  // The role to be granted.
  String role = "roles/logging.logWriter";