Merge pull request #436 from FlowFuse/ui-template-docs-msgpayload

Reference issue re: full msg not sending in this.send() for ui-template

docs/nodes/widgets/ui-template.md

@@ -43,7 +43,7 @@ You have access to a number of built-in variables in your `ui-template` node:
 
 We also offer some helper functions for the Node-RED integration too:
 
-- `this.send` - Send a message to the Node-RED flow.
+- `this.send` - Send a message to the Node-RED flow. Currently limited to sending msg.payload only - [Issue #427](https://github.com/FlowFuse/node-red-dashboard/issues/427)
 - `this.$socket.on('msg-input' + this.id, (msg) = { ... })` - will listen to any messages received by your `ui-template `node and react accordingly.
 
 ### Example (Raw JavaScript)