cherry-pick from nyc-dev: docs: Add ARC documentation TOC file

Bug: 30114799
Change-Id: I4884bf4a39ae99e661365040d5b34d5b8e2d2ea2
Original-Change-Id: Ib4e3c5b255c9e1e9c2894b3703deb1d38f252fba
1 file changed