fix: add resource reference to proto files

chore: update copyright and comments

PiperOrigin-RevId: 309990843

Source-Author: Google APIs <noreply@google.com>
Source-Date: Tue May 5 11:51:12 2020 -0700
Source-Repo: googleapis/googleapis
Source-Sha: 4bef0001ac7040431ea24b6187424fdec9c08b1b
Source-Link: googleapis/googleapis@4bef000

google-cloud-bigquerystorage/src/main/java/com/google/cloud/bigquery/storage/v1beta1/BaseBigQueryStorageClient.java

@@ -413,7 +413,7 @@ public final BatchCreateReadSessionStreamsResponse batchCreateReadSessionStreams
    * }
    * </code></pre>
    *
-   * @param stream Stream to finalize.
+   * @param stream Required. Stream to finalize.
    * @throws com.google.api.gax.rpc.ApiException if the remote call fails
    */
   public final void finalizeStream(Stream stream) {
@@ -509,7 +509,7 @@ public final UnaryCallable<FinalizeStreamRequest, Empty> finalizeStreamCallable(
    * }
    * </code></pre>
    *
-   * @param originalStream Stream to split.
+   * @param originalStream Required. Stream to split.
    * @throws com.google.api.gax.rpc.ApiException if the remote call fails
    */
   public final SplitReadStreamResponse splitReadStream(Stream originalStream) {