docs: locking: Discourage from calling disable_irq() in atomic

Correct the example in the documentation so that disable_irq() is not being
called in atomic context.

disable_irq() calls sleeping synchronize_irq(), it's not allowed to call
them in atomic context.

Signed-off-by: Alexander Sverdlin <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Reviewed-by: Manfred Spraul <[email protected]>
Cc: [email protected]
Link: https://lore.kernel.org/lkml/87k02wbs2n.ffs@tglx/
Link: https://lore.kernel.org/r/[email protected]

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