Progress reporting during image load was added in 415dd8688618ac2b3872c6a5b5af3afcef2c3e10, but the corresponding query-parameter was not documented in the API docs. This updates the API docs, and adds a response example both with quiet enabled and disabled. Signed-off-by: Sebastiaan van Stijn <github@gone.nl> Upstream-commit: d13ed38471decb332e9a0872854a97730d548583 Component: engine