partition_manager: kconfig: Fix typo

Tiny fix.

Signed-off-by: Dominik Ermel <[email protected]>

Author: de-nordic

subsys/partition_manager/Kconfig

@@ -232,7 +232,7 @@ config PM_EXTERNAL_FLASH_MCUBOOT_SECONDARY
 config PM_OVERRIDE_EXTERNAL_DRIVER_CHECK
 	bool "Override external driver check"
 	help
-	  When enabled, will include all external flash stroage areas without
+	  When enabled, will include all external flash storage areas without
 	  being gated on the NORDIC_QSPI_NOR Kconfig, can be enabled to use
 	  non-QSPI external flash chips from partition manager.