apply suggestion from code review

Author: SZeltaat

Doc/extending/extending.rst

@@ -77,11 +77,9 @@ the module and a copyright notice if you like).
 All user-visible symbols defined by :file:`Python.h` have a prefix of ``Py`` or
 ``PY``, except those defined in standard header files.
 
-Note that :file:`Python.h` excludes ``<stdio.h>``, ``<string.h>``,
-``<errno.h>``, and ``<stdlib.h>`` as they are not used by Python anymore.
-For backward compatibility of existing third party C extensions, they will be
-included if Py_LIMITED_API is not defined and for limited C API version 3.10
-and older.
+For backward compatibility of existing third party C extensions, :file:`Python.h`
+includes ``<stdio.h>``, ``<string.h>``, ``<errno.h>``, and ``<stdlib.h>`` if
+:c:macro:`Py_LIMITED_API` is not defined or for limited C API version 3.10 and older.
 The ``<ctype.h>`` and ``<unistd.h>`` headers are also not included for limited
 C API version 3.13 and newer.