Adds --name to Redis container in restart example

[RScrafted]

Description

This PR fixes a bug in the sequential code examples for Docker restart policies.

The Problem

The current documentation lists the following two steps sequentially:

1. docker run -d --restart unless-stopped redis
2. docker update --restart unless-stopped redis

Step 2 assumes the container name is redis. However, because Step 1 does not explicitly define a --name, Docker assigns a randomly generated name, causing Step 2 to fail with the following error:

Error response from daemon: No such container: redis

The Solution

Added the --name redis flag to the initial docker run command so that the subsequent docker update command works seamlessly as written.

docker run -d --name redis --restart unless-stopped redis

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[dvdksn]

LGTM thanks!