Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/arch/powerpc/kernel/ptrace.c b/arch/powerpc/kernel/ptrace.c
index 895b082..55613e3 100644
--- a/arch/powerpc/kernel/ptrace.c
+++ b/arch/powerpc/kernel/ptrace.c
@@ -463,7 +463,7 @@
 #ifdef CONFIG_VSX
 /*
  * Currently to set and and get all the vsx state, you need to call
- * the fp and VMX calls aswell.  This only get/sets the lower 32
+ * the fp and VMX calls as well.  This only get/sets the lower 32
  * 128bit VSX registers.
  */