message: doc: small wording tweaks
diff: -Meshing: Compaction without Relocation
  -======================================
  +Mesh: A compacting malloc(3) implementation
  +===========================================
  +
  +Mesh is a drop in replacement for
  +[malloc(3)](http://man7.org/linux/man-pages/man3/malloc.3.html), that
  +can compact the heap without rewriting application pointers.
  Implementation Overview
  -----------------------
  @@ -35,6 +39,5 @@ BUILDING
  --------
  ```
  -$ git submodule update --init; ./configure --debug; make test
  +$ git submodule update --init; ./configure; make
  ```
  -
  