Updated comment for input hue range

Updated the comment indicating the range of input hue. We will allow
users to send in hue in the range of [-1,360], as [0,360] is the
standard range of hue and additionally we will allow sending in -1, to
indicate absence of hue/grey.

Bug: 427908562
Change-Id: I33be0b796a9e4dc11d6a3bdd88a00cda95ca2616
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6803840
Reviewed-by: Alison Gale <agale@chromium.org>
Reviewed-by: David Pennington <dpenning@chromium.org>
Commit-Queue: Jay Kapadia <jaykapadia389@gmail.com>
Cr-Commit-Position: refs/heads/main@{#1495081}