Document restriction on embedded objects (#784)
Document restriction on embedded objects (#784)

* restriction on embedded objects

* Enhanced restriction on embedded properties

* Update docs/src/main/asciidoc/spanner.adoc

Co-authored-by: Elena Felder <0b7cca6a04174464bbe4ea0669a35145de5f24bc@users.noreply.github.com>

Co-authored-by: Elena Felder <0b7cca6a04174464bbe4ea0669a35145de5f24bc@users.noreply.github.com>
GoogleCloudPlatform/spring-cloud-gcp,GoogleCloudPlatform/spring-cloud-gcp,GoogleCloudPlatform/spring-cloud-gcp,GoogleCloudPlatform/spring-cloud-gcp,GoogleCloudPlatform/spring-cloud-gcp