Update document for sprite view
Update document for sprite-view component.
supported by following commit:
commit 4667c1a75a3c73e6683730240cb3749d358ffd25 (HEAD -> master, origin/master, origin/HEAD) Author: Steel Wheels Project <wheel@tcn.zaq.ne.jp> Date: Sun May 5 16:38:04 2019 +0900
Update document for sprite-view component.