chore: update jsdoc with macro license (#383)

Author: summer-ji-eng

packages/google-cloud-language/.jsdoc.js

@@ -12,6 +12,9 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 //
+// ** This file is automatically generated by gapic-generator-typescript. **
+// ** https://github.com/googleapis/gapic-generator-typescript **
+// ** All changes to this file may be overwritten. **
 
 'use strict';