Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/net/sched/act_api.c b/net/sched/act_api.c
index 15873e1..14b42f4 100644
--- a/net/sched/act_api.c
+++ b/net/sched/act_api.c
@@ -999,7 +999,7 @@
 	switch (n->nlmsg_type) {
 	case RTM_NEWACTION:
 		/* we are going to assume all other flags
-		 * imply create only if it doesnt exist
+		 * imply create only if it doesn't exist
 		 * Note that CREATE | EXCL implies that
 		 * but since we want avoid ambiguity (eg when flags
 		 * is zero) then just set this