CLEANUP: fix typos in the htx subsystem

Fix typos detected in the code comments of the htx subsystem.
diff --git a/include/proto/htx.h b/include/proto/htx.h
index 9ee71e5..f15d931 100644
--- a/include/proto/htx.h
+++ b/include/proto/htx.h
@@ -272,7 +272,7 @@
 	return (blk ? htx_get_blk_type(blk) : HTX_BLK_UNUSED);
 }
 
-/* Returns the position of block immediatly before the one pointed by <pos>. If
+/* Returns the position of block immediately before the one pointed by <pos>. If
  * the message is empty or if <pos> is the position of the head, -1 returned.
  *
  * An signed 32-bits integer is returned to handle -1 case. Blocks position are
@@ -303,7 +303,7 @@
 	return ((pos == -1) ? NULL : htx_get_blk(htx, pos));
 }
 
-/* Returns the position of block immediatly after the one pointed by <pos>. If
+/* Returns the position of block immediately after the one pointed by <pos>. If
  * the message is empty or if <pos> is the position of the tail, -1 returned.
  *
  * An signed 32-bits integer is returned to handle -1 case. Blocks position are