docs(router): add ignore prefix into the file naming conventions guide

docs/router/framework/react/routing/file-naming-conventions.md

@@ -11,6 +11,7 @@ File-based routing requires that you follow a few simple file naming conventions
 | **`$` Token**                      | Route segments with the `$` token are parameterized and will extract the value from the URL pathname as a route `param`.                                                                                                                                                                                                                                                        |
 | **`_` Prefix**                     | Route segments with the `_` prefix are considered to be pathless layout routes and will not be used when matching its child routes against the URL pathname.                                                                                                                                                                                                                    |
 | **`_` Suffix**                     | Route segments with the `_` suffix exclude the route from being nested under any parent routes.                                                                                                                                                                                                                                                                                 |
+| **`-` Prefix**                     | Files and folders with the `-` prefix are excluded from the route tree. They will not be added to the `routeTree.gen.ts` file and can be used to colocate logic in route folders.                                                                                                                                                                                               |
 | **`(folder)` folder name pattern** | A folder that matches this pattern is treated as a **route group**, preventing the folder from being included in the route's URL path.                                                                                                                                                                                                                                          |
 | **`index` Token**                  | Route segments ending with the `index` token (before any file extensions) will match the parent route when the URL pathname matches the parent route exactly. This can be configured via the `indexToken` configuration option, see [options](../../../api/file-based-routing.md#indextoken).                                                                                   |
 | **`.route.tsx` File Type**         | When using directories to organise routes, the `route` suffix can be used to create a route file at the directory's path. For example, `blog.post.route.tsx` or `blog/post/route.tsx` can be used as the route file for the `/blog/post` route. This can be configured via the `routeToken` configuration option, see [options](../../../api/file-based-routing.md#routetoken). |