Docs: Feedback for Deploying on Docker - Unable to add custom jar to classpath

Hi, I have some feedback about [this page](https://github.com/hazelcast/hz-docs/edit/main/docs/modules/deploy/pages/deploying-with-docker.adoc)

I tried adding my jar to classpath following this doc but it is not working.

I have following files in present working directory: `my.jar` and `hazelcast.xml`.

First tried using directory as CLASSPATH like this.

```
docker run -d --name hazelcast \
--network hz-network \
-p 5701:5701 \
-v "$(pwd)":/opt/hazelcast/ext \
-e HZ_NETWORK_PUBLICADDRESS=192.168.0.130:5701 \
-e CLASSPATH="/opt/hazelcast/ext/" \
-e JAVA_OPTS="-Dhazelcast.config=/opt/hazelcast/ext/hazelcast.xml" \
hazelcast/hazelcast:5.3
```

Then I tried adding my.jar directly like this

```
docker run -d --name hazelcast \
--network hz-network \
-p 5701:5701 \
-e HZ_NETWORK_PUBLICADDRESS=192.168.0.130:5701 \
-v "$(pwd)/my.jar":/opt/hazelcast-jet/lib/my.jar \
-v "$(pwd)":/opt/hazelcast/ext \
-e JAVA_OPTS="-Dhazelcast.config=/opt/hazelcast/ext/hazelcast.xml" \
hazelcast/hazelcast:5.3
```

I am getting `Caused by: com.hazelcast.core.HazelcastException: java.lang.ClassNotFoundException: com.example.hazelcast.maploader.SettingMapLoader` for my custom MapLoader class.

**Expected behaviour:**

My custom Map Loader should have been added to classpath.

Review docs/modules/deploy/pages/deploying-with-docker.adoc and reproduce the reported Docker commands with my.jar, hazelcast.xml, and the custom MapLoader. Verify how the Hazelcast 5.3 image handles the mounted jar and CLASSPATH, then update the page with working instructions and confirm the ClassNotFoundException is resolved.

Written by the indexing model from the issue text.