Adjust PYTHONUNBUFFERED docs

WolframAlph · WolframAlph · commit 24fd0a978cc0 · 2025-01-01T13:49:02.000+01:00
diff --git a/Doc/using/cmdline.rst b/Doc/using/cmdline.rst
@@ -797,7 +797,7 @@ conflict.
 
 .. envvar:: PYTHONUNBUFFERED
 
-   If this is set to a non-empty string it is equivalent to specifying the
+   If this is set, it is equivalent to specifying the
    :option:`-u` option.
 
 
