Update ARM-9 to indicate it's withdrawn.

No activity on this as an independent proposal, plus its
scope was subsumed into ARM-8 about dependency injection.
Merge pull request #46 from hlindberg/master

initial ARM-8 description
Merge pull request #47 from ahpook/master

Mark ARM-9 withdrawn.
Edited for clarity (I hope)
Merge pull request #48 from ahpook/master

ARM-8 index edits
ARM-8 Hiera2 W.I.P