fix javadoc

Author: rahul2393

google-cloud-spanner/src/main/java/com/google/cloud/spanner/SpannerOptions.java

@@ -1557,20 +1557,14 @@ public Builder setExperimentalHost(String host) {
       return this;
     }
 
-    /**
-     * Enables gRPC-GCP extension with the default settings. Do not set
-     * GOOGLE_CLOUD_SPANNER_MULTIPLEXED_SESSIONS to true in combination with this option, as
-     * Multiplexed sessions are not supported for gRPC-GCP.
-     */
+    /** Enables gRPC-GCP extension with the default settings. */
     public Builder enableGrpcGcpExtension() {
       return this.enableGrpcGcpExtension(null);
     }
 
     /**
      * Enables gRPC-GCP extension and uses provided options for configuration. The metric registry
-     * and default Spanner metric labels will be added automatically. Do not set
-     * GOOGLE_CLOUD_SPANNER_MULTIPLEXED_SESSIONS to true in combination with this option, as
-     * Multiplexed sessions are not supported for gRPC-GCP.
+     * and default Spanner metric labels will be added automatically.
      */
     public Builder enableGrpcGcpExtension(GcpManagedChannelOptions options) {
       this.grpcGcpExtensionEnabled = true;

google-cloud-spanner/src/test/java/com/google/cloud/spanner/ChannelUsageTest.java

@@ -20,7 +20,6 @@
 import static io.grpc.Grpc.TRANSPORT_ATTR_REMOTE_ADDR;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertTrue;
-import static org.junit.Assume.assumeFalse;
 
 import com.google.cloud.NoCredentials;
 import com.google.cloud.spanner.MockSpannerServiceImpl.StatementResult;
@@ -212,9 +211,6 @@ private SpannerOptions createSpannerOptions() {
   public void testUsesAllChannels() throws InterruptedException {
     final int multiplier = 2;
     try (Spanner spanner = createSpannerOptions().getService()) {
-      assumeFalse(
-          "GRPC-GCP is currently not supported with multiplexed sessions",
-          isMultiplexedSessionsEnabled(spanner));
       DatabaseClient client = spanner.getDatabaseClient(DatabaseId.of("p", "i", "d"));
       ListeningExecutorService executor =
           MoreExecutors.listeningDecorator(Executors.newFixedThreadPool(numChannels * multiplier));
@@ -244,11 +240,4 @@ public void testUsesAllChannels() throws InterruptedException {
     }
     assertEquals(numChannels, executeSqlLocalIps.size());
   }
-
-  private boolean isMultiplexedSessionsEnabled(Spanner spanner) {
-    if (spanner.getOptions() == null || spanner.getOptions().getSessionPoolOptions() == null) {
-      return false;
-    }
-    return spanner.getOptions().getSessionPoolOptions().getUseMultiplexedSession();
-  }
 }