Update pubsub sample links (#3285)

Author: stetra

google-cloud-clients/google-cloud-pubsub/README.md

@@ -196,7 +196,7 @@ try {
 ```
 #### Complete source code
 
-In [CreateTopicAndPublishMessages.java](../google-cloud-examples/src/main/java/com/google/cloud/examples/pubsub/snippets/CreateTopicAndPublishMessages.java) and [CreateSubscriptionAndConsumeMessages.java](../google-cloud-examples/src/main/java/com/google/cloud/examples/pubsub/snippets/CreateSubscriptionAndConsumeMessages.java) we put together all the code shown above into two programs. The programs assume that you are running on Compute Engine, App Engine Flexible or from your own desktop.
+In [CreateTopicAndPublishMessages.java](../../google-cloud-examples/src/main/java/com/google/cloud/examples/pubsub/snippets/CreateTopicAndPublishMessages.java) and [CreateSubscriptionAndConsumeMessages.java](../../google-cloud-examples/src/main/java/com/google/cloud/examples/pubsub/snippets/CreateSubscriptionAndConsumeMessages.java) we put together all the code shown above into two programs. The programs assume that you are running on Compute Engine, App Engine Flexible or from your own desktop.
 
 Transport
 ---------