docs(client-rds): Documentation improvements for create, describe, an…

…d modify DB clusters and DB instances.

clients/client-rds/src/commands/DescribeDBClustersCommand.ts

@@ -36,7 +36,7 @@ export interface DescribeDBClustersCommandOutput extends DBClusterMessage, __Met
 
 /**
  * @public
- * <p>Returns information about Amazon Aurora DB clusters and Multi-AZ DB clusters. This API supports pagination.</p>
+ * <p>Describes existing Amazon Aurora DB clusters and Multi-AZ DB clusters. This API supports pagination.</p>
  *          <p>For more information on Amazon Aurora DB clusters, see
  *           <a href="https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/CHAP_AuroraOverview.html">
  *               What is Amazon Aurora?</a> in the <i>Amazon Aurora User Guide</i>.</p>

clients/client-rds/src/commands/DescribeDBInstancesCommand.ts

@@ -36,7 +36,7 @@ export interface DescribeDBInstancesCommandOutput extends DBInstanceMessage, __M
 
 /**
  * @public
- * <p>Returns information about provisioned RDS instances. This API supports pagination.</p>
+ * <p>Describes provisioned RDS instances. This API supports pagination.</p>
  *          <note>
  *             <p>This operation can also return information for Amazon Neptune DB instances and Amazon DocumentDB instances.</p>
  *          </note>

clients/client-rds/src/commands/ModifyDBClusterCommand.ts

@@ -36,7 +36,7 @@ export interface ModifyDBClusterCommandOutput extends ModifyDBClusterResult, __M
 
 /**
  * @public
- * <p>Modify the settings for an Amazon Aurora DB cluster or a Multi-AZ DB cluster.
+ * <p>Modifies the settings of an Amazon Aurora DB cluster or a Multi-AZ DB cluster.
  *            You can change one or more settings by specifying these parameters and the new values in the
  *            request.</p>
  *          <p>For more information on Amazon Aurora DB clusters, see