[PATCH] docs/misra: specify behaviour of checker for Directive 4.10

[Alessandro Zucchelli <alessandro.zucchelli@xxxxxxxxxxx>]

MISRA C:2012 Directive 4.10 states as following: Precautions shall be
taken in order to prevent the contents of a header file being included
more than once.

This commit updates the documentation to describe the behavior defined
for the checker.

No functional change.

Signed-off-by: Alessandro Zucchelli <alessandro.zucchelli@xxxxxxxxxxx>
---
 docs/misra/rules.rst | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/docs/misra/rules.rst b/docs/misra/rules.rst
index 80e5e972ad..f5858b00bb 100644
--- a/docs/misra/rules.rst
+++ b/docs/misra/rules.rst
@@ -68,6 +68,8 @@ maintainers if you want to suggest a change.
        header file being included more than once
      - Files that are intended to be included more than once do not need to
        conform to the directive
+     - A guard identifier is reported if the same guard identifier is redefined
+       or undefined anywhere in the project
 
    * - `Dir 4.11 
<https://gitlab.com/MISRA/MISRA-C/MISRA-C-2012/Example-Suite/-/blob/master/D_04_11.c>`_
      - Required
-- 
2.43.0