grpc: Remove todo

Author: Jozott00

grpc/grpc-core/src/commonMain/kotlin/kotlinx/rpc/grpc/internal/suspendUtils.kt

@@ -14,7 +14,6 @@ import kotlinx.rpc.grpc.StatusCode
 import kotlinx.rpc.grpc.StatusException
 import kotlinx.rpc.internal.utils.InternalRpcApi
 
-// todo really needed?
 @InternalRpcApi
 public fun <T> Flow<T>.singleOrStatusFlow(
     expected: String,