Install: Docker Compose example contradicts bootstrap configuration guidance

[coderabbitai]

Description

The Docker Compose example in docs/install/container/docker.md includes cratedb03 in the cluster.initial_master_nodes list for all three services, which contradicts the earlier quick-start walkthrough narrative.

Issue Details

The quick-start section states that crate03 should join the cluster "with no vote" by omitting it from cluster.initial_master_nodes. However, the Docker Compose example includes cratedb03 in this setting for all services:

-Ccluster.initial_master_nodes=cratedb01,cratedb02,cratedb03

This makes cratedb03 a voting member, changing the bootstrap behavior and contradicting the guidance.

Suggested Fix

Either:

1. Remove cratedb03 from the cluster.initial_master_nodes setting in the Compose example to match the walkthrough
2. Update the prose to reflect that all three nodes are initial master nodes

References

• Pull Request: Chore: Convert install/** into MyST format #395
• Review Comment: Chore: Convert install/** into MyST format #395 (comment)
• Requested by: @amotl