genirq/manage: Cleanup kernel doc comments

Get rid of the extra tab to make it consistent.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/all/20250429065421.710273122@linutronix.de

Author: KAGA-KOKO