[parrot/parrot] d5b638: [docs] adjust docs for trace_mem_block()

[GitHub]

  Branch: refs/heads/smoke-me/gc-ptrdiff-gh1200
  Home:   https://github.com/parrot/parrot
  Commit: d5b638521e69026d14960a05985d2b23043294b5
      https://github.com/parrot/parrot/commit/d5b638521e69026d14960a05985d2b23043294b5
  Author: Reini Urban <rurban at cpanel.net>
  Date:   2015-02-05 (Thu, 05 Feb 2015)

  Changed paths:
    M ChangeLog
    M src/gc/system.c

  Log Message:
  -----------
  [docs] adjust docs for trace_mem_block()