Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/arch/arm/Kconfig-nommu b/arch/arm/Kconfig-nommu
index 901e6df..2cef8e1 100644
--- a/arch/arm/Kconfig-nommu
+++ b/arch/arm/Kconfig-nommu
@@ -34,7 +34,7 @@
 	  used instead of the auto-probing which utilizes the register.
 
 config REMAP_VECTORS_TO_RAM
-	bool 'Install vectors to the begining of RAM' if DRAM_BASE
+	bool 'Install vectors to the beginning of RAM' if DRAM_BASE
 	depends on DRAM_BASE
 	help
 	  The kernel needs to change the hardware exception vectors.