Correctly look up `os.devnull` reference
@@ -82,7 +82,7 @@ Site
Additionally, the environment variable `PIP_CONFIG_FILE` can be used to specify
a configuration file that's loaded first, and whose values are overridden by
-the values set in the aforementioned files. Setting this to {ref}`os.devnull`
+the values set in the aforementioned files. Setting this to {any}`os.devnull`
disables the loading of _all_ configuration files.
### Loading order
