Add missing reference to text in docs (#11)

- Adds a missing reference to the Text docs inside the text
customization example

docs/porting-embed.md

@@ -172,6 +172,8 @@ See also:
 
 The embed ships with default text in english, but you can override any text that is rendered by the embed, if you want to support a different language or customize the text otherwise.
 
+You don't have to provide all text overrides. Your overrides will be merged into the default text.
+
 ```js
 const embed = await PortingEmbed(session, {
   options: {
@@ -187,6 +189,9 @@ const embed = await PortingEmbed(session, {
 })
 ```
 
+See also:
+- [Text](#text) for a list of all text overrides.
+
 ### Continue after all fields were filled out
 
 When the user entered all fields in all steps of the wizard, the embed will not render any UI anymore. You can handle this in your app by listening for the `completed` event.