CLEANUP: assorted typo fixes in the code and comments

This is 33rd iteration of typo fixes
diff --git a/src/hlua.c b/src/hlua.c
index 7a666d4..75176a6 100644
--- a/src/hlua.c
+++ b/src/hlua.c
@@ -8579,7 +8579,7 @@
 	return 0;
 }
 
-/* This functio is an LUA binding. It permits to register a task
+/* This function is an LUA binding. It permits to register a task
  * executed in parallel of the main HAroxy activity. The task is
  * created and it is set in the HAProxy scheduler. It can be called
  * from the "init" section, "post init" or during the runtime.