docs: Don't format internal MPT docs

This is the driver API document, so the internal stuff is just noise here.
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/driver-api/message-based.rst

@@ -7,24 +7,6 @@ Fusion message devices
 .. kernel-doc:: drivers/message/fusion/mptbase.c
    :export:
 
-.. kernel-doc:: drivers/message/fusion/mptbase.c
-   :internal:
-
 .. kernel-doc:: drivers/message/fusion/mptscsih.c
    :export:
 
-.. kernel-doc:: drivers/message/fusion/mptscsih.c
-   :internal:
-
-.. kernel-doc:: drivers/message/fusion/mptctl.c
-   :internal:
-
-.. kernel-doc:: drivers/message/fusion/mptspi.c
-   :internal:
-
-.. kernel-doc:: drivers/message/fusion/mptfc.c
-   :internal:
-
-.. kernel-doc:: drivers/message/fusion/mptlan.c
-   :internal:
-