[Telemetry] Update perf bot health documentation to include handoff instructions.

tools/perf/docs/perf_bot_sheriffing.md

 # Perf Bot Sheriffing
 
 The perf bot sheriff is responsible for keeping the bots on the chromium.perf
 waterfall up and running, and triaging performance test failures and flakes.
 
 **[Rotation calendar](https://calendar.google.com/calendar/embed?src=google.com_2fpmo740pd1unrui9d7cgpbg2k%40group.calendar.google.com)**
 
 ## Key Responsibilities
 
 *   [Handle Device and Bot Failures](#Handle-Device-and-Bot-Failures)
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 **[Pri-1 bugs](https://bugs.chromium.org/p/chromium/issues/list?can=2&q=label%3APerformance-Sheriff-BotHealth+label%3APri-1)**
 should be pinged daily, and checked to make sure someone is following up. Pri-1
 bugs are for a red test (not yet disabled), purple bot, or failing device. Here
 is the [list of Pri-1 bugs that have not been pinged today](https://bugs.chromium.org/p/chromium/issues/list?can=2&q=label:Performance-Sheriff-BotHealth%20label:Pri-1%20modified-before:today-1&sort=modified).
 
 **[Pri-2 bugs](https://bugs.chromium.org/p/chromium/issues/list?can=2&q=label%3APerformance-Sheriff-BotHealth+label%3APri-2)**
 are for disabled tests. These should be pinged weekly, and work towards fixing
 should be ongoing when the sheriff is not working on a Pri-1 issue. Here is the
 [list of Pri-2 bugs that have not been pinged in a week](https://bugs.chromium.org/p/chromium/issues/list?can=2&q=label:Performance-Sheriff-BotHealth%20label:Pri-2%20modified-before:today-7&sort=modified).
 
+## Shift Hand-off
+
+At the end of your shift you should send out a message to the next sheriff It
+should detail any ongoing issues you are trying to resolve. This can contain new
+bugs you have filed and bisects you are waiting to finish. If there has been any
+significant updates on older issues that the next sheriff should know about they
+should also be included. This will greatly decrease the amount of time needed
+for the next sheriff to come up to speed.
+
+There is also a weekly debrief that you should see on your calendar titled
+**Weekly Speed Sheriff Retrospective**. For this meeting you should prepare
+any highlights or lowlights from your sheriffing shift as well as any other
+feedback you may have that could improve future sheriffing shifts.
+
 <!-- Unresolved issues:
 1. Do perf sheriffs watch the bisect waterfall?
 2. Do perf sheriffs watch the internal clank waterfall?
 -->