added some docker compose examples; fixed defaults to wrong host; updated watcher behavior to retry connection every 3 secs until success or until cancelled

docs/docker_socket_proxy.md

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+## Docker Socket Proxy
+
+For docker client on other machine, set this up, then add `name: tcp://<machine_ip>:2375` to `config.yml` under `docker` section
+
+```yml
+# compose.yml on remote machine (e.g. server1)
+services:
+  docker-proxy:
+    container_name: docker-proxy
+    image: ghcr.io/linuxserver/socket-proxy
+    environment:
+      - ALLOW_START=1 #optional
+      - ALLOW_STOP=1 #optional
+      - ALLOW_RESTARTS=0 #optional
+      - AUTH=0 #optional
+      - BUILD=0 #optional
+      - COMMIT=0 #optional
+      - CONFIGS=0 #optional
+      - CONTAINERS=1 #optional
+      - DISABLE_IPV6=1 #optional
+      - DISTRIBUTION=0 #optional
+      - EVENTS=1 #optional
+      - EXEC=0 #optional
+      - IMAGES=0 #optional
+      - INFO=0 #optional
+      - NETWORKS=0 #optional
+      - NODES=0 #optional
+      - PING=1 #optional
+      - POST=1 #optional
+      - PLUGINS=0 #optional
+      - SECRETS=0 #optional
+      - SERVICES=0 #optional
+      - SESSION=0 #optional
+      - SWARM=0 #optional
+      - SYSTEM=0 #optional
+      - TASKS=0 #optional
+      - VERSION=1 #optional
+      - VOLUMES=0 #optional
+    volumes:
+      - /var/run/docker.sock:/var/run/docker.sock
+    restart: always
+    tmpfs:
+      - /run
+    ports:
+      - 2375:2375
+```
+
+```yml
+# config.yml on go-proxy machine
+autocert:
+    ... # your config
+
+providers:
+    include:
+        ...
+    docker:
+        ...
+        server1: tcp://<machine_ip>:2375
+```