Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>

samples/Kconfig

@@ -55,7 +55,7 @@ config SAMPLE_KFIFO
 	  If in doubt, say "N" here.
 
 config SAMPLE_KDB
-	tristate "Build kdb command exmaple -- loadable modules only"
+	tristate "Build kdb command example -- loadable modules only"
 	depends on KGDB_KDB && m
 	help
 	  Build an example of how to dynamically add the hello