Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/Documentation/vm/overcommit-accounting b/Documentation/vm/overcommit-accounting
index 21c7b1f..706d7ed 100644
--- a/Documentation/vm/overcommit-accounting
+++ b/Documentation/vm/overcommit-accounting
@@ -4,7 +4,7 @@
 		address space are refused. Used for a typical system. It
 		ensures a seriously wild allocation fails while allowing
 		overcommit to reduce swap usage.  root is allowed to 
-		allocate slighly more memory in this mode. This is the 
+		allocate slightly more memory in this mode. This is the 
 		default.
 
 1	-	Always overcommit. Appropriate for some scientific