doc/add-blog_auto_namespace-setting

[wesleyboar]

Description

Add missing setting to relevant doc.

To what base should this PR point? I only tested this setting on 1.1.1, so I am currently only comfortable suggesting the change for 1.1.1.

Describe:

• Add BLOG_AUTO_NAMESPACE to global settings doc
• Fixes inability of user to set "INSTANCE NAMESPACE" after auto setup.

References

N/A

Checklist

• [x] I have read the contribution guide
• [ ] Code lint checked via inv lint
• [ ] changes file included (see docs)
• [ ] Usage documentation added in case of new features
• [ ] Tests added

[yakky]

Thanks @wesleyboar for your contribution. I will merge this as soon as I have github actions back up and running

[yakky]

Fixed in #623

Updating version 1.1 documentation is not feasible, but I guess that people will refer to latest version documentation anyway