[phobos] [D-Programming-Language/phobos] e2ce2b: add documentation example for RBTree

[GitHub via phobos]

  Branch: refs/heads/master
  Home:   https://github.com/D-Programming-Language/phobos
  Commit: e2ce2b36f8d66bc0fe09128c7c4f03538aca90af
      https://github.com/D-Programming-Language/phobos/commit/e2ce2b36f8d66bc0fe09128c7c4f03538aca90af
  Author: Sebastian Wilzbach <seb at wilzba.ch>
  Date:   2016-03-11 (Fri, 11 Mar 2016)

  Changed paths:
    M std/container/rbtree.d

  Log Message:
  -----------
  add documentation example for RBTree


  Commit: e41a79932768dac0f4c372d3f9f63dee4d2dff5e
      https://github.com/D-Programming-Language/phobos/commit/e41a79932768dac0f4c372d3f9f63dee4d2dff5e
  Author: Steven Schveighoffer <schveiguy at yahoo.com>
  Date:   2016-03-15 (Tue, 15 Mar 2016)

  Changed paths:
    M std/container/rbtree.d

  Log Message:
  -----------
  Merge pull request #4041 from greenify/docu-rbtree

add documentation example for RBTree


Compare: https://github.com/D-Programming-Language/phobos/compare/7b3d744e8c88...e41a79932768