//BAZEL_CHEATSHEET.md: Add instructions for //:puppeteer_screenshot_server.

Change-Id: Ieed9da14708a8748b4ff8014b2b93f35e280d3a6
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/658256
Commit-Queue: Joe Gregorio <jcgregorio@google.com>
Commit-Queue: Leandro Lovisolo <lovisolo@google.com>
Auto-Submit: Leandro Lovisolo <lovisolo@google.com>
Reviewed-by: Joe Gregorio <jcgregorio@google.com>
diff --git a/BAZEL_CHEATSHEET.md b/BAZEL_CHEATSHEET.md
index 6ce5493..3818800 100644
--- a/BAZEL_CHEATSHEET.md
+++ b/BAZEL_CHEATSHEET.md
@@ -328,10 +328,19 @@
 $ bazel test //golden/modules/dots-sk:dots-sk_puppeteer_test
 ```
 
-To view the screenshots captured by a Puppeteer test, use the `//:extract_puppeteer_screenshots`
+To view the screenshots captured by a Puppeteer test, use the `//:puppeteer_screenshot_server`
 target:
 
 ```
+$ bazel run //:puppeteer_screenshot_server
+...
+Serving Puppeteer screenshots viewer at: http://<hostname>:8000
+```
+
+To extract the screenshots captured by a Puppeteer test into a directory, use the
+`//:extract_puppeteer_screenshots` target:
+
+```
 $ mkdir /tmp/screenshots
 $ bazel run //:extract_puppeteer_screenshots -- --output_dir /tmp/screenshots
 ```