Add example docs for LDoc

druid/base/back_handler.lua

@@ -1,3 +1,6 @@
+--- Component to handle back key
+-- @module base.back_handler
+
 local data = require("druid.data")
 
 local M = {}
@@ -5,21 +8,25 @@ M.interest = {
 	data.ON_INPUT
 }
 
-
+--- Component init function
+-- @tparam table self component instance
+-- @tparam callback callback on back button
+-- @tparam[opt] params callback argument
 function M.init(self, callback, params)
-	self.event = data.A_ANDR_BACK
+	self.event = data.ACTION_BACK
 	self.callback = callback
 	self.params = params
 end
 
 
---- input handler
--- @param action_id - input action id
--- @param action - input action
+--- Input handler for component
+-- @tparam string action_id on_input action id
+-- @tparam table action on_input action
 function M.on_input(self, action_id, action)
 	if action[data.RELEASED] then
 		self.callback(self.parent.parent, self.params)
 	end
+
 	return true
 end