Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index b69d714..1b0f98b 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -933,7 +933,7 @@
 	depends on SOC_PNX8335
 	help
 	  Hardware driver for the PNX833x's watchdog. This is a
-	  watchdog timer that will reboot the machine after a programable
+	  watchdog timer that will reboot the machine after a programmable
 	  timer has expired and no process has written to /dev/watchdog during
 	  that time.