Documents build API "remote" parameter

Introduced in Docker v0.4.5 / Remove API v1.1 (#848), the remote
parameter of the API method POST /build allows to specify a buildable
remote URL (HTTPS, HTTP or Git).

Signed-off-by: Vincent Giersch <vincent.giersch@ovh.net>

docs/sources/reference/api/docker_remote_api_v1.17.md

@@ -1072,6 +1072,7 @@ Query Parameters:
 -   **dockerfile** - path within the build context to the Dockerfile
 -   **t** – repository name (and optionally a tag) to be applied to
         the resulting image in case of success
+-   **remote** – git or HTTP/HTTPS URI build source
 -   **q** – suppress verbose build output
 -   **nocache** – do not use the cache when building the image
 -   **pull** - attempt to pull the image even if an older image exists locally