bpo-38600: NULL -> ``NULL``. (GH-17001)
Also fix some other formatting.
diff --git a/Doc/c-api/import.rst b/Doc/c-api/import.rst
index ee09876..c6fc330 100644
--- a/Doc/c-api/import.rst
+++ b/Doc/c-api/import.rst
@@ -207,8 +207,8 @@
.. c:function:: PyObject* PyImport_GetModule(PyObject *name)
Return the already imported module with the given name. If the
- module has not been imported yet then returns NULL but does not set
- an error. Returns NULL and sets an error if the lookup failed.
+ module has not been imported yet then returns ``NULL`` but does not set
+ an error. Returns ``NULL`` and sets an error if the lookup failed.
.. versionadded:: 3.7