Issue #26638: Mask undefined CLI options to defeat new Sphinx warnings
diff --git a/Doc/library/warnings.rst b/Doc/library/warnings.rst
index 3af76ce..e82bb97 100644
--- a/Doc/library/warnings.rst
+++ b/Doc/library/warnings.rst
@@ -258,13 +258,13 @@
Warnings that are only of interest to the developer are ignored by default. As
such you should make sure to test your code with typically ignored warnings
made visible. You can do this from the command-line by passing :option:`-Wd <-W>`
-to the interpreter (this is shorthand for :option:`-W default`). This enables
+to the interpreter (this is shorthand for :option:`!-W default`). This enables
default handling for all warnings, including those that are ignored by default.
To change what action is taken for encountered warnings you simply change what
-argument is passed to :option:`-W`, e.g. :option:`-W error`. See the
+argument is passed to :option:`-W`, e.g. :option:`!-W error`. See the
:option:`-W` flag for more details on what is possible.
-To programmatically do the same as :option:`-Wd`, use::
+To programmatically do the same as :option:`!-Wd`, use::
warnings.simplefilter('default')