Updated docs to reflect changes in code:

  - assignments/constructors that took const F& now take F
  - no need to use &free_function for assignment from free functions, unless
    using MSVC6.5


[SVN r11946]

libs/function

@@ -1 +1 @@
-Subproject commit db5399d4476aa7e1519eb49a686780018f19d650
+Subproject commit 1a7478bbd18437df0d8f788333974b6cd62e7bf2