PEP 741: Fix table formatting (#3710)

peps/pep-0741.rst

@@ -468,6 +468,8 @@ Following options can be get by ``sys.get_config()`` and set and
 ``sys.set_config()``.
 
 .. list-table::
+   :widths: 20 20 50
+   :header-rows: 1
 
    * - Option
      - Type
@@ -556,6 +558,8 @@ Following options can be get ``sys.get_config()``, but cannot be set by
 ``sys.set_config()``.
 
 .. list-table::
+   :widths: 20 20 50
+   :header-rows: 1
 
    * - Option
      - Type
@@ -616,6 +620,8 @@ Following options are only to initialize Python, are not in
 ``sys.get_config_names()``, and cannot be get with ``sys.get_config()``.
 
 .. list-table::
+   :widths: 20 20 50
+   :header-rows: 1
 
    * - Option
      - Type