feat(search): add doc for search extension result

SEARCH-511

Author: Richard-lumapps

docs/javascript/api.md

@@ -86,6 +86,7 @@ And `configuration` is an object that allows these properties:
 | `targets.SEARCH`                     | Target id for the search page.                                                      | [Documentation](./capabilities#search)                      |
 | `targets.SEARCH_BOX`                 | Target id for the search box.                                                       | [Documentation](./capabilities#search-box)                  |
 | `targets.SEARCH_CUSTOM_METADATA`     | Target id for search custom metadata.                                               | [Documentation](./capabilities#search-custom-metadata)      |
+| `targets.SEARCH_EXTENSION_RESULT`  | Target id for result coming from search extensions. For further information, please refer to the [search SDK documentation](https://docs.lumapps.com/docs/ls/content/7922416882680847/docs/devportal-devportal-landing/devportal-l7646654821110653/devportal-l18963592772091442/devportal-l2842548453481841/devportal-l5187611046361645).                                               | [Documentation](./capabilities#search-extension-result)      |
 | `targets.SEARCH_RESULT_ICON`         | Target id for icons of the search result page and quick search.                     | [Documentation](./capabilities#search-result-icon)          |
 | `targets.SEARCH_TAB`                 | Target id for search tab.                                                           | [Documentation](./capabilities#search-tab)                  |
 | `targets.SETTINGS`                   | Target id for the settings menu.                                                    | [Documentation](./capabilities#settings)                    |

docs/javascript/assets/search-extension-result-doc.png

@@ -592,6 +592,25 @@ Target that allows customizing icons of the search results of both the search pa
 This allows specific customization depending on result type / data etc...
 In addition, a `SearchThumbnail` component is available to be as close as possible to the current implementation.
 
+### Search extension result
+
+Target that allows replacing search results coming from any search extensions.
+
+![Search extension results](./assets/search-extension-result-doc.png "Search extension result")
+
+#### Compatibility
+
+|               |                                        |
+| ------------- | -------------------------------------- |
+| Target ID     | `search-extension-result`                   |
+| Description   | Target the search extension result.         |
+| Placements    | Compatible with placements: `REPLACE`. |
+| Disable       | No compatibility.                      |
+| Changing text | No compatibility.                      |
+
+**Note:** Using `context` it is possible to retrieve the full data of the search result. 
+This, combined with RawHTML component, allows a full customization of the search result.
+
 #### Use cases
 
 - [Replace icons for a specific result type](./use-cases#replace-icons-for-a-specific-result-type)