Remove help notes from the ReleaseNotes.

Non-comprehensive list of changes in this release

=================================================

.. NOTE

   For small 1-3 sentence descriptions, just add an entry at the end of

   this list. If your description won't fit comfortably in one bullet

   point (e.g. maybe you would like to give an example of the

   functionality, or simply have a lot to talk about), see the `NOTE` below

   for adding a new subsection.

* This is expected to be the last release of LLVM which compiles using a C++98

  toolchain. We expect to start using some C++11 features in LLVM and other

  sub-projects starting after this release. That said, we are committed to

* OCaml bindings have been significantly extended to cover almost all of the

  LLVM libraries.

* ... next change ...

.. NOTE

   If you would like to document a larger change, then you can add a

   subsection about it right here. You can copy the following boilerplate

   and un-indent it (the indentation causes it to be inside this comment).

   Special New Feature

   -------------------

   Makes programs 10x faster by doing Special New Thing.

Mips Target

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