Merge pull request #1227 from danielqsj/update-annotation-doc

Update annotations doc with base-url-scheme

Author: aledbf

docs/annotations.md

@@ -47,6 +47,7 @@ Key:
 | `app-root` | Redirect requests without a path (i.e., for `/`) to this location. | | nginx, haproxy, trafficserver
 | `rewrite-target` | Replace matched Ingress `path` with this value. | | nginx, trafficserver
 | `add-base-url` | Add `<base>` tag to HTML. | | nginx
+| `base-url-scheme` | Specify the scheme of the `<base>` tags. | | nginx
 | `preserve-host` | Whether to pass the client request host (`true`) or the origin hostname (`false`) in the HTTP Host field. | | trafficserver
 
 ## Miscellaneous