Issue #16714: use 'raise' exceptions, don't 'throw'.

Patch by Serhiy Storchaka.
diff --git a/Lib/test/test_socketserver.py b/Lib/test/test_socketserver.py
index 3b333bc..0dbb8e2 100644
--- a/Lib/test/test_socketserver.py
+++ b/Lib/test/test_socketserver.py
@@ -58,7 +58,7 @@
 def simple_subprocess(testcase):
     pid = os.fork()
     if pid == 0:
-        # Don't throw an exception; it would be caught by the test harness.
+        # Don't raise an exception; it would be caught by the test harness.
         os._exit(72)
     yield None
     pid2, status = os.waitpid(pid, 0)