Put listdir default argument into declaration.
diff --git a/Doc/library/os.rst b/Doc/library/os.rst
index a4dec4c..3e13edd 100644
--- a/Doc/library/os.rst
+++ b/Doc/library/os.rst
@@ -1049,10 +1049,10 @@
Availability: Unix.
-.. function:: listdir([path])
+.. function:: listdir(path='.')
Return a list containing the names of the entries in the directory given by
- *path* (default: '.'). The list is in arbitrary order. It does not include the special
+ *path* (default: ``'.'``). The list is in arbitrary order. It does not include the special
entries ``'.'`` and ``'..'`` even if they are present in the directory.
This function can be called with a bytes or string argument, and returns