CLEANUP: assorted typo fixes in the code and comments

This is 10th iteration of typo fixes
diff --git a/reg-tests/http-messaging/h1_to_h1.vtc b/reg-tests/http-messaging/h1_to_h1.vtc
index 7694014..5b02f17 100644
--- a/reg-tests/http-messaging/h1_to_h1.vtc
+++ b/reg-tests/http-messaging/h1_to_h1.vtc
@@ -242,7 +242,7 @@
 	expect resp.status == 200
 	expect resp.body == "response 2"
 
-	# third request is valid and advertises (and sends) somme contents
+	# third request is valid and advertises (and sends) some contents
 	txreq \
 	  -req "POST" \
 	  -url "/test23.html" \