message: Document the `discover` event for search result clicks.
diff: @@ -52,11 +52,12 @@ learn how to contribute the integration yourself!
  The following table summarizes events that, depending on the plugins you have
  installed, may be captured.
  -| Action | Provided By | Subject |
  -| ---------- | -------------- | --------------------------------------------------- |
  -| `navigate` | Backstage Core | The URL of the page that was navigated to |
  -| `click` | Backstage Core | The text of the link that was clicked on |
  -| `search` | Backstage Core | The search term entered in any search bar component |
  +| Action | Subject | Other Notes |
  +| ---------- | --------------------------------------------------- | ----------------------------------------------------------------- |
  +| `navigate` | The URL of the page that was navigated to | |
  +| `click` | The text of the link that was clicked on | The `to` attribute represents the URL clicked to |
  +| `search` | The search term entered in any search bar component | The `searchTypes` attribute holds `types` constraining the search |
  +| `discover` | The title of the search result that was clicked on | The `value` is the result rank. A `to` attribute is also provided |
  If there is an event you'd like to see captured, please [open an
  issue][add-event] describing the event you want to see and the questions it
  