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

Patch by Serhiy Storchaka.
diff --git a/Lib/test/test_winreg.py b/Lib/test/test_winreg.py
index 55163c9..918b312 100644
--- a/Lib/test/test_winreg.py
+++ b/Lib/test/test_winreg.py
@@ -245,7 +245,7 @@
 
     def test_changing_value(self):
         # Issue2810: A race condition in 2.6 and 3.1 may cause
-        # EnumValue or QueryValue to throw "WindowsError: More data is
+        # EnumValue or QueryValue to raise "WindowsError: More data is
         # available"
         done = False
 
@@ -291,7 +291,7 @@
 
     def test_dynamic_key(self):
         # Issue2810, when the value is dynamically generated, these
-        # throw "WindowsError: More data is available" in 2.6 and 3.1
+        # raise "WindowsError: More data is available" in 2.6 and 3.1
         try:
             EnumValue(HKEY_PERFORMANCE_DATA, 0)
         except OSError as e: