[PATCH v2] docs/misra/rules.rst: add Rule 17.1

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxx>
---
Changes in v2:
- separated 17.1 in its own patch
- add a comment

diff --git a/docs/misra/rules.rst b/docs/misra/rules.rst
index 8a659d8d47..f29b4c3d9a 100644
--- a/docs/misra/rules.rst
+++ b/docs/misra/rules.rst
@@ -189,6 +189,12 @@ existing codebase are work-in-progress.
      - A switch-expression shall not have essentially Boolean type
      -
 
+   * - `Rule 17.1 
<https://gitlab.com/MISRA/MISRA-C/MISRA-C-2012/Example-Suite/-/blob/master/R_17_01.c>`_
+     - Required
+     - The features of <stdarg.h> shall not be used
+     - It is understood that in some limited circumstances <stdarg.h> is
+       appropriate to use, such as the implementation of printk.
+
    * - `Rule 17.3 
<https://gitlab.com/MISRA/MISRA-C/MISRA-C-2012/Example-Suite/-/blob/master/R_17_03.c>`_
      - Mandatory
      - A function shall not be declared implicitly