docs: add stop alias for unload

Signed-off-by: Dorin Geman <dorin.geman@docker.com>

Author: doringeman

cmd/cli/docs/reference/docker_model_unload.yaml

@@ -1,4 +1,5 @@
 command: docker model unload
+aliases: docker model unload, docker model stop
 short: Unload running models
 long: Unload running models
 usage: docker model unload (MODEL [MODEL ...] [--backend BACKEND] | --all)

cmd/cli/docs/reference/model_unload.md

@@ -3,6 +3,10 @@
 <!---MARKER_GEN_START-->
 Unload running models
 
+### Aliases
+
+`docker model unload`, `docker model stop`
+
 ### Options
 
 | Name        | Type     | Default | Description                |