Fix duplicate 'bundle exec' in Docker web image CMD

[enzowilliam]

Summary

Fixed a documentation error in the Docker deployment guide where the Web Dockerfile example contained a duplicate bundle exec command.

Changes

• File: self-hosted/deployment/docker.mdx (line 162)
• Before: CMD bundle exec bundle exec rails s -b 0.0.0.0 -p 3000
• After: CMD bundle exec rails s -b 0.0.0.0 -p 3000

Why this matters

This error could confuse users who are building their own Chatwoot Docker images based on the documentation examples. The duplicate bundle exec is incorrect and should be removed for accuracy.

Testing

• Verified the fix in the local documentation file
• Confirmed the Worker Dockerfile example does not have this issue