[phobos] [D-Programming-Language/phobos] 6af614: fix changelog ddoc

[GitHub via phobos]

  Branch: refs/heads/stable
  Home:   https://github.com/D-Programming-Language/phobos
  Commit: 6af6144252bf32746dd96bb5a4d6ff3c0b0e8ea6
      https://github.com/D-Programming-Language/phobos/commit/6af6144252bf32746dd96bb5a4d6ff3c0b0e8ea6
  Author: Martin Nowak <code at dawg.eu>
  Date:   2016-03-24 (Thu, 24 Mar 2016)

  Changed paths:
    M changelog.dd

  Log Message:
  -----------
  fix changelog ddoc

- use XREF/CXREF
- remove wrong LNAME2 anchor in TOC