Apply suggestion from @StanFromIreland

Co-authored-by: Stan Ulbrych <89152624+StanFromIreland@users.noreply.github.com>

Author: ZeroIntensity

Doc/c-api/datetime.rst

@@ -24,7 +24,7 @@ macros.
 
    .. code-block::
 
-      PyDateTime_IMPORT();  // semi-colon is optional but recommended
+      PyDateTime_IMPORT;  // semi-colon is optional but recommended
       if (PyErr_Occurred()) { /* cleanup */ }
 
    .. warning::