[PATCH] docs/misra: add rule 11.9

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

From: Stefano Stabellini <stefano.stabellini@xxxxxxx>

Following up from the MISRA C group discussion, add Rule 11.9 to
docs/misra/rules.rst.

Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxx>
---
Rule 13.1 also discussed but it is already in docs/misra/rules.rst
---
 docs/misra/rules.rst | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/docs/misra/rules.rst b/docs/misra/rules.rst
index 8e7d17d242..28dc3a4d66 100644
--- a/docs/misra/rules.rst
+++ b/docs/misra/rules.rst
@@ -373,6 +373,11 @@ maintainers if you want to suggest a change.
      - A cast shall not remove any const or volatile qualification from the 
type pointed to by a pointer
      -
 
+   * - `Rule 11.9 
<https://gitlab.com/MISRA/MISRA-C/MISRA-C-2012/Example-Suite/-/blob/master/R_11_09.c>`_
+     - Required
+     - The macro NULL shall be the only permitted form of integer null pointer 
constant
+     -
+
    * - `Rule 12.5 
<https://gitlab.com/MISRA/MISRA-C/MISRA-C-2012/Example-Suite/-/blob/master/R_12_05.c>`_
      - Mandatory
      - The sizeof operator shall not have an operand which is a function
-- 
2.25.1