Update the hash documentation to reflect the reorganisation of the headers (still need to write a 'what's changed' page to explain the changes).

[SVN r32800]

libs/functional

@@ -1 +1 @@
-Subproject commit 1f657699a2ed01ba99d79121ba3d94b354e261a7
+Subproject commit 7aeaa0f669e61a8c8f256ec6dcbd21bb8bab4214