Fixed typo, updated image

Author: dfreniche

docs/80-edit-mapping-rules/20-edit-mapping-books-book-genre.mdx

@@ -29,7 +29,7 @@ genres: [
 ```
 
 - On the MongoDB diagram view, click the `books` collection.
-- Click on the edit edit icon of `genres`. Deselect `id`, This is a child relationship of `bookGenres`, and we'll merge these fields into the parent, to avoid too much unneccesary nesting.
+- Click on the edit icon of `genres`. Deselect `id`, This is a child relationship of `bookGenres`, and we'll merge these fields into the parent, to avoid too much unneccesary nesting.
 - Click `Save and close`.
 - Click on the edit icon of the `book_genre` embedded array.
 - Change the field name from `bookGenres` to `genres`.