docs: fix javadoc code example for awaitOptimizeRestoredTableAsync #1617
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Fixes rendering of https://cloud.google.com/java/docs/reference/google-cloud-bigtable/latest/com.google.cloud.bigtable.admin.v2.BigtableTableAdminClient#com_google_cloud_bigtable_admin_v2_BigtableTableAdminClient_awaitOptimizeRestoredTableAsync_com_google_cloud_bigtable_admin_v2_models_OptimizeRestoredTableOperationToken_