[CHANGE ME] Re-generated to pick up changes in the API or client library generator. (#255)

* Integrate Python GAPIC Microgenerator in googleapis.
This PR uses using documentai as an example.
Depends on googleapis/gapic-generator-python#402

PiperOrigin-RevId: 309824146

Source-Author: Google APIs <noreply@google.com>
Source-Date: Mon May 4 15:06:44 2020 -0700
Source-Repo: googleapis/googleapis
Source-Sha: e0f9d9e1f9de890db765be46f45ca8490723e3eb
Source-Link: googleapis/googleapis@e0f9d9e

* 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

Author: yoshi-automation

README.md

@@ -41,7 +41,7 @@ If you are using Maven without BOM, add this to your dependencies:
 <dependency>
   <groupId>com.google.cloud</groupId>
   <artifactId>google-cloud-bigquerystorage</artifactId>
-  <version>0.131.0-beta</version>
+  <version>0.131.1-beta</version>
 </dependency>
 
 ```

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) {