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

samples/hw_breakpoint/data_breakpoint.c

@@ -19,7 +19,7 @@
  *
  * This file is a kernel module that places a breakpoint over ksym_name kernel
  * variable using Hardware Breakpoint register. The corresponding handler which
- * prints a backtrace is invoked everytime a write operation is performed on
+ * prints a backtrace is invoked every time a write operation is performed on
  * that variable.
  *
  * Copyright (C) IBM Corporation, 2009