docs: remove reference to returning clauses for Batch DML (#2644)

* docs: remove reference to returning clauses for Batch DML Remove the reference to THEN RETURN / RETURNING clauses for Batch DML requests, as these clauses are ignored for batch DML and not returned to the client. * 🦉 Updates from OwlBot post-processor See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md --------- Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

Author: olavloite

README.md

@@ -57,13 +57,13 @@ implementation 'com.google.cloud:google-cloud-spanner'
 If you are using Gradle without BOM, add this to your dependencies:
 
 ```Groovy
-implementation 'com.google.cloud:google-cloud-spanner:6.47.0'
+implementation 'com.google.cloud:google-cloud-spanner:6.48.0'
 ```
 
 If you are using SBT, add this to your dependencies:
 
 ```Scala
-libraryDependencies += "com.google.cloud" % "google-cloud-spanner" % "6.47.0"
+libraryDependencies += "com.google.cloud" % "google-cloud-spanner" % "6.48.0"
 ```
 <!-- {x-version-update-end} -->
 
@@ -431,7 +431,7 @@ Java is a registered trademark of Oracle and/or its affiliates.
 [kokoro-badge-link-5]: http://storage.googleapis.com/cloud-devrel-public/java/badges/java-spanner/java11.html
 [stability-image]: https://img.shields.io/badge/stability-stable-green
 [maven-version-image]: https://img.shields.io/maven-central/v/com.google.cloud/google-cloud-spanner.svg
-[maven-version-link]: https://central.sonatype.com/artifact/com.google.cloud/google-cloud-spanner/6.47.0
+[maven-version-link]: https://central.sonatype.com/artifact/com.google.cloud/google-cloud-spanner/6.48.0
 [authentication]: https://github.com/googleapis/google-cloud-java#authentication
 [auth-scopes]: https://developers.google.com/identity/protocols/oauth2/scopes
 [predefined-iam-roles]: https://cloud.google.com/iam/docs/understanding-roles#predefined_roles

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

@@ -162,11 +162,10 @@ default ResultSet analyzeUpdateStatement(
  }
 
  /**
- * Executes a list of DML statements (which can include simple DML statements or DML statements
- * with returning clause) in a single request. The statements will be executed in order and the
- * semantics is the same as if each statement is executed by {@code executeUpdate} in a loop. This
- * method returns an array of long integers, each representing the number of rows modified by each
- * statement.
+ * Executes a list of DML statements in a single request. The statements will be executed in order
+ * and the semantics is the same as if each statement is executed by {@code executeUpdate} in a
+ * loop. This method returns an array of long integers, each representing the number of rows
+ * modified by each statement.
  *
  * <p>If an individual statement fails, execution stops and a {@code SpannerBatchUpdateException}
  * is returned, which includes the error and the number of rows affected by the statements that