Doc: add a missing period (GH-21819)

diff --git a/Doc/library/json.rst b/Doc/library/json.rst
index b923c8e1670529e19d2e32848d7e6d7a27179097..e1a246aad6190b7e6cb3f7a664f9f16986e5d3d2 100644 (file)
--- a/Doc/library/json.rst
+++ b/Doc/library/json.rst
@@ -745,7 +745,7 @@ Command line options
 
 .. cmdoption:: --indent, --tab, --no-indent, --compact
 
-   Mutually exclusive options for whitespace control
+   Mutually exclusive options for whitespace control.
 
    .. versionadded:: 3.9