docs: Add context information for custom templates

Author: szuperaz

docusaurus/docs/Angular/components/channel-preview.mdx

@@ -27,6 +27,8 @@ The channel list uses the `ChannelPreview` component to display channels, if you
 </ng-template>
 ```
 
+Your custom template can receive the same inputs (with the same name) as the default `ChannelPreview` component.
+
 :::note
 
 If you want to build your own `ChannelPreview` component, you might find the following building blocks useful:

docusaurus/docs/Angular/components/message-input.mdx

@@ -38,6 +38,8 @@ If you want to create your own message input, here is how to use it:
 
 The default chat UI uses the message input in two different places: at the bottom of the channel to send new message, and in the message list to edit a message.
 
+Your custom template can receive the same inputs (with the same name) as the default `MessageInput` component.
+
 :::note
 If you want to create your own message input, you can use the following building blocks:
 

docusaurus/docs/Angular/components/message.mdx

@@ -53,6 +53,8 @@ The message list uses the `Message` component to display messages, if you want t
 </ng-template>
 ```
 
+Your custom template can receive the same inputs (with the same name) as the default `Message` component.
+
 :::note
 
 If you want to build your own `Message` component, you might find the following building blocks useful: