Provide some detail about valentine password

site/dev/testing/skialab.md

 SkiaLab
 =======
 
 Overview
 --------
 
 Skia's buildbots are hosted in three places:
 
 * Google Compute Engine. This is the preferred location for bots which don't
   need to run on physical hardware, ie. anything that doesn't require a GPU,
@@ skipping 53 matching lines @@
    which contains information about the machines in the lab, pre-filtered to
    select the machine which runs the buildslave in question.
 3. The information box will display the hostname of the machine as well as the
    KVM switch and number used to access the machine, if the machine is in the
    SkiaLab.
 4. Walk over to the lab. While standing at the KVM switch indicated by the host
    information page, double tap \<ctrl\> and then press the number or letter from
    the information page. It may be necessary to move or click the mouse to wake
    the machine up.
 5. Log in to the machine if necessary. The password is stored in
-   [Valentine](https://valentine/).
+   [Valentine](https://valentine/) as "Chapel Hill buildbot slave password".
 
 ### Rebooting a problematic Android device
 
 Follow the same process as above, with some slight changes:
 
 1. On the [Status](https://status.skia.org/) page, click the box for the failed
    build.
 2. Click the "Lookup" link for the host machine. Remember the name of the
    buildslave which ran the build.
 3. The hosts page will display the information used to access the host machine
@@ skipping 131 matching lines @@
 11. Select the external drive to use for /home/partimag, something like,
     "1000GB_ntfs_My_Passport".
 12. Select the bot_img directory.
 13. "Beginner"
 14. "savedisk"
 15. Choose a name for the disk image. The convention is:
     `skiabot-<hardware type>-<OS>-<disk image revision #>`
 12. Choose the hard drive in the machine. It should be the only option.
 13. "y"
 14. Choose "reboot" or "shut down" when finished.