run check-api-pr;add doc

Author: mpeddada1

ci/abi-dumps/google_cloud_cpp_spanner.expected.abi.dump.gz

@@ -125,4 +125,45 @@ auto limit = google::cloud::bigtable::RowReader::NO_ROWS_LIMIT;
 
 ### Spanner
 
+<details>
+<summary>Removed <code>spanner::ClientOptions</code> class</summary>
+
+The `spanner::ClientOptions` class has been removed. Use `google::cloud::Options`
+instead to set the following as needed:
+
+* `spanner::QueryOptimizerVersionOption`
+* `spanner::QueryOptimizerStatisticsPackageOption`
+* `spanner::RequestPriorityOption`
+* `spanner::RequestTagOption`
+
+**Before:**
+
+```cpp
+#include "google/cloud/spanner/client.h"
+
+// ...
+
+namespace spanner = ::google::cloud::spanner;
+auto client_options = spanner::ClientOptions().set_query_options(
+    spanner::QueryOptions().set_optimizer_version("1"));
+
+auto client = spanner::Client(connection, client_options);
+```
+
+**After:**
+
+```cpp
+#include "google/cloud/spanner/client.h"
+#include "google/cloud/spanner/options.h"
+
+// ...
+
+namespace spanner = ::google::cloud::spanner;
+auto options = google::cloud::Options{}.set<spanner::QueryOptimizerVersionOption>("1");
+
+auto client = spanner::Client(connection, options);
+```
+
+</details>
+
 ### Storage