[xen staging] docs/misra/rules.rst: add rule 16.6 and 20.12

[patchbot@xxxxxxx]

commit 4cac80e22600d5a38d77c65e9a6507c752efc155
Author:     Stefano Stabellini <stefano.stabellini@xxxxxxx>
AuthorDate: Tue Feb 13 14:33:32 2024 -0800
Commit:     Stefano Stabellini <stefano.stabellini@xxxxxxx>
CommitDate: Thu Feb 29 15:24:39 2024 -0800

    docs/misra/rules.rst: add rule 16.6 and 20.12
    
    Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxx>
    Acked-by: Julien Grall <jgrall@xxxxxxxxxx>
---
 docs/misra/rules.rst | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/docs/misra/rules.rst b/docs/misra/rules.rst
index 182331089d..c185366966 100644
--- a/docs/misra/rules.rst
+++ b/docs/misra/rules.rst
@@ -478,6 +478,12 @@ maintainers if you want to suggest a change.
        adhere to Rule 16.2 would result in increased complexity and
        maintenance difficulty, and could potentially introduce bugs. 
 
+   * - `Rule 16.6 
<https://gitlab.com/MISRA/MISRA-C/MISRA-C-2012/Example-Suite/-/blob/master/R_16_06.c>`_
+     - Required
+     - Every switch statement shall have at least two switch-clauses
+     - Single-clause switches are allowed when they do not involve a
+       default label.
+
    * - `Rule 16.7 
<https://gitlab.com/MISRA/MISRA-C/MISRA-C-2012/Example-Suite/-/blob/master/R_16_07.c>`_
      - Required
      - A switch-expression shall not have essentially Boolean type
@@ -554,6 +560,13 @@ maintainers if you want to suggest a change.
        evaluation
      -
 
+   * - `Rule 20.12 
<https://gitlab.com/MISRA/MISRA-C/MISRA-C-2012/Example-Suite/-/blob/master/R_20_12.c>`_
+     - A macro parameter used as an operand to the # or ## operators,
+       which is itself subject to further macro replacement, shall only
+       be used as an operand to these operators
+     - Required
+     - Variadic macros are allowed to violate the rule.
+
    * - `Rule 20.13 
<https://gitlab.com/MISRA/MISRA-C/MISRA-C-2012/Example-Suite/-/blob/master/R_20_13.c>`_
      - Required
      - A line whose first token is # shall be a valid preprocessing
--
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