Manual Speedtest Service information (home-assistant#688)

Carlo Costanzo · fabaff · commit f277109a6def · 2016-07-27T19:12:07.000+02:00
Added new information I just learned about Speedtest from @nkgilley.
diff --git a/source/_components/sensor.speedtest.markdown b/source/_components/sensor.speedtest.markdown
@@ -74,3 +74,5 @@ Configuration variables:
 - **day** (*Optional*): Specify the day(s) of the month to schedule the speedtest. Use a list for multiple entries. Default is None.
 
 This component uses [speedtest-cli](https://github.com/sivel/speedtest-cli) to gather network performance data from Speedtest.net.  Please be aware of the potential [inconsistencies](https://github.com/sivel/speedtest-cli#inconsistency) that this component may display.
+
+When HA first starts up, the values on the speedtest will show as Unknown.  You can use the service `sensor.update_speedtest` to run a manual speedtest and populate the data or just wait for the next regularly scheduled test.
