Added note about Google Home (home-assistant#4258)

DubhAd · fabaff · commit c7b69da976bd · 2017-12-20T23:27:54.000+01:00
It's apparently not clear what this provides
diff --git a/source/_components/google_assistant.markdown b/source/_components/google_assistant.markdown
@@ -13,6 +13,10 @@ featured: true
 ha_release: 0.56
 ---
 
+<p class='note'>
+This is to provide you with voice control via Google Assistant (on your mobile or tablet) or a Google Home device.
+</p>
+
 # Google Assistant Docs
 The Google Assistant component requires a bit more setup than most due to the way Google requires Assistant Apps to be set up.
 
