Add chat and social intents.

Author: jschulte

source/includes/_methods.md

@@ -61,6 +61,8 @@ The current supported type is `button`, though other types may be added in the f
 
 Button Intent is a concept used in the API as a way to categorize the type of functionality your CTA provides. The current supported intent types are:
 
+`chat`
+
 `check-availability`
 
 `eprice`
@@ -75,6 +77,8 @@ Button Intent is a concept used in the API as a way to categorize the type of fu
 
 `send-to-phone`
 
+`social`
+
 `test-drive`
 
 `text-us`