Revert r63934 -- it was mixing two patches.
diff --git a/Doc/using/cmdline.rst b/Doc/using/cmdline.rst
index 5100c21..a6a6ecf 100644
--- a/Doc/using/cmdline.rst
+++ b/Doc/using/cmdline.rst
@@ -222,6 +222,13 @@
manipulations of :data:`sys.path` that it entails.
+.. cmdoption:: -t
+
+ Issue a warning when a source file mixes tabs and spaces for indentation in a
+ way that makes it depend on the worth of a tab expressed in spaces. Issue an
+ error when the option is given twice (:option:`-tt`).
+
+
.. cmdoption:: -u
Force stdin, stdout and stderr to be totally unbuffered. On systems where it