make: add target to check kernel-doc comments

When we have a kernel-doc comment, it should be properly formatted.
Since this is a task that can be easily automated, add a new target
which checks all

make: add target to check kernel-doc comments

When we have a kernel-doc comment, it should be properly formatted.
Since this is a task that can be easily automated, add a new target
which checks all comments for proper kernel-doc formatting.

The kernel-doc script is copied as-is from the Linux kernel.

Signed-off-by: Nico Boehr <nrb@linux.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-ID: <20231106125352.859992-2-nrb@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

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