[m-rev.] diff: delete XXX from std_util interface

[Julien Fischer]

Delete XXX from std_util interface.

library/std_util.m:
 	Delete an XXX comment regarding alternative syntax for
 	compose/3 from the interface to this module -- it shows
 	up in the library reference manual otherwise.

diff --git a/library/std_util.m b/library/std_util.m
index 8c68d01..f66719a 100644
--- a/library/std_util.m
+++ b/library/std_util.m
@@ -29,7 +29,6 @@
      % compose(F, G, X) = F(G(X))
      %
      % Function composition.
-    % XXX It would be nice to have infix `o' or somesuch for this.
      %
  :- func compose(func(T2) = T3, func(T1) = T2, T1) = T3.