Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/include/net/gen_stats.h b/include/net/gen_stats.h
index fa15771..a79b6cf 100644
--- a/include/net/gen_stats.h
+++ b/include/net/gen_stats.h
@@ -11,7 +11,7 @@
 	struct sk_buff *  skb;
 	struct nlattr *   tail;
 
-	/* Backward compatability */
+	/* Backward compatibility */
 	int               compat_tc_stats;
 	int               compat_xstats;
 	void *            xstats;