irqchip/gic-v3: Fix typos in PMR/RPR SCR_EL3.FIQ handling explanation

The GICv3 driver explanation related to PMR/RPR and SCR_EL3.FIQ
secure/non-secure priority handling contains a couple of typos.

Fix them.
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Marc Zyngier <maz@kernel.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20210121182252.29320-1-lorenzo.pieralisi@arm.com

drivers/irqchip/irq-gic-v3.c

@@ -75,10 +75,10 @@ static DEFINE_STATIC_KEY_TRUE(supports_deactivate_key);
  * are presented to the GIC CPUIF as follow:
  *     (GIC_(R)DIST_PRI[irq] >> 1) | 0x80;
  *
- * If SCR_EL3.FIQ == 1, the values writen to/read from PMR and RPR at non-secure
+ * If SCR_EL3.FIQ == 1, the values written to/read from PMR and RPR at non-secure
  * EL1 are subject to a similar operation thus matching the priorities presented
  * from the (re)distributor when security is enabled. When SCR_EL3.FIQ == 0,
- * these values are unchanched by the GIC.
+ * these values are unchanged by the GIC.
  *
  * see GICv3/GICv4 Architecture Specification (IHI0069D):
  * - section 4.8.1 Non-secure accesses to register fields for Secure interrupt