fix typo in test name and enable single thread on windows

zebra-rpc/src/server/tests/vectors.rs

@@ -23,14 +23,14 @@ use super::super::*;
 
 /// Test that the JSON-RPC server spawns when configured with a single thread.
 #[test]
-#[cfg(not(target_os = "windows"))]
 fn rpc_server_spawn_single_thread() {
     rpc_server_spawn(false)
 }
 
 /// Test that the JSON-RPC server spawns when configured with multiple threads.
 #[test]
-fn rpc_sever_spawn_parallel_threads() {
+#[cfg(not(target_os = "windows"))]
+fn rpc_server_spawn_parallel_threads() {
     rpc_server_spawn(true)
 }