CLEANUP: assorted typo fixes in the code and comments
This is fifth iteration of typo fixes
diff --git a/contrib/plug_qdisc/plug_qdisc.c b/contrib/plug_qdisc/plug_qdisc.c
index 606a834..bc47f5d 100644
--- a/contrib/plug_qdisc/plug_qdisc.c
+++ b/contrib/plug_qdisc/plug_qdisc.c
@@ -10,7 +10,7 @@
* XXX Please, first note that this code is not safe. XXX
* It was developed fast so that to reproduce a bug.
* You will certainly have to adapt it to your application.
- * But at least it gives an idea about how to programatically use plug
+ * But at least it gives an idea about how to programmatically use plug
* queueing disciplines.
*/