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

Patch by Serhiy Storchaka.
diff --git a/Lib/test/test_zipfile.py b/Lib/test/test_zipfile.py
index 087a90a..9bd3b58 100644
--- a/Lib/test/test_zipfile.py
+++ b/Lib/test/test_zipfile.py
@@ -811,7 +811,7 @@
         with zipfile.ZipFile(data, mode="w") as zipf:
             zipf.writestr("foo.txt", "O, for a Muse of Fire!")
 
-        # This is correct; calling .read on a closed ZipFile should throw
+        # This is correct; calling .read on a closed ZipFile should raise
         # a RuntimeError, and so should calling .testzip.  An earlier
         # version of .testzip would swallow this exception (and any other)
         # and report that the first file in the archive was corrupt.