sql: deprecate client

This client was accidentally generated under the wrong package. The
correct package is "sqladmin". This client will be removed in a
future release.

Change-Id: Ia9495074ff2cbb933e02b871afd441a285db3761
Reviewed-on: https://code-review.googlesource.com/c/google-api-go-client/+/54410
Reviewed-by: Tyler Bui-Palsulich <tbp@google.com>
diff --git a/sql/v1beta4/sql-gen.go b/sql/v1beta4/sql-gen.go
index 51b58f1..a30e5c9 100644
--- a/sql/v1beta4/sql-gen.go
+++ b/sql/v1beta4/sql-gen.go
@@ -39,6 +39,10 @@
 //   sqlService, err := sql.NewService(ctx, option.WithTokenSource(config.TokenSource(ctx, token)))
 //
 // See https://godoc.org/google.golang.org/api/option/ for details on options.
+//
+// Deprecated: please use "google.golang.org/api/sqladmin/v1beta4" instead. This
+// client was accidentally generated under the wrong package. The correct package
+// is "sqladmin". This client will be removed in a future release.
 package sql // import "google.golang.org/api/sql/v1beta4"
 
 import (