Updating docs for RemoteInput non-textual inputs per API review request.

Bug: 37706825

Test: Documentation-only change
Change-Id: I5987868916010f1143e2d8227ea3ea7952c87bc7
(cherry picked from commit 4bff5a1f5a20afcfb5e8add044c050dcb1d74435)
1 file changed