Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/Documentation/SubmittingPatches b/Documentation/SubmittingPatches
index 689e237..e439cd0 100644
--- a/Documentation/SubmittingPatches
+++ b/Documentation/SubmittingPatches
@@ -729,7 +729,7 @@
   <http://lkml.org/lkml/2005/4/7/183>
 
 Andi Kleen, "On submitting kernel patches"
-  Some strategies to get difficult or controversal changes in.
+  Some strategies to get difficult or controversial changes in.
   http://halobates.de/on-submitting-patches.pdf
 
 --