Update Android autoroller documentation

BUG=skia:5538
NOTRY=true
DOCS_PREVIEW= https://skia.org/?cl=13266
Change-Id: I76fa8db5ea9916fab2ef0f8058157dac96d52517

Change-Id: I76fa8db5ea9916fab2ef0f8058157dac96d52517
Reviewed-on: https://skia-review.googlesource.com/13266
Reviewed-by: Matt Sarett <msarett@google.com>
Commit-Queue: Ravi Mistry <rmistry@google.com>
1 file changed