CLEANUP: assorted typo fixes in the code and comments

This is 35th iteration of typo fixes
diff --git a/src/http_act.c b/src/http_act.c
index fb77f80..737d6d8 100644
--- a/src/http_act.c
+++ b/src/http_act.c
@@ -1379,7 +1379,7 @@
 		s->txn->status = 103;
 	}
 
-	/* Add the HTTP Early Hint HTTP 103 response heade */
+	/* Add the HTTP Early Hint HTTP 103 response header */
 	value->data = build_logline(s, b_tail(value), b_room(value), &rule->arg.http.fmt);
 	if (!htx_add_header(htx, rule->arg.http.str, ist2(b_head(value), b_data(value))))
 		goto error;