docs: Table formatting broken in auth_setup.md

## Issue
The default attribute names table at https://docs.humansignal.com/guide/auth_setup.html#Connect-your-Identity-Provider-to-Label-Studio-Enterprise is rendering as preformatted code instead of a proper HTML table.

## Root Cause
The table markdown in `docs/source/guide/auth_setup.md` (lines 69-74) has 4-space indentation, which causes it to be rendered as a code block.

## Fix
Remove the 4-space indentation from lines 69-74 to allow the table to render properly.

### Current (broken):
```markdown
**The default attribute names are:**

| Data | Default Attribute |
| --- | --- |
| Email address | Email |
| First or given name | FirstName |
| Last or family name | LastName |
| Group name | Groups |
```

### Fixed:
```markdown
**The default attribute names are:**

| Data | Default Attribute |
| --- | --- |
| Email address | Email |
| First or given name | FirstName |
| Last or family name | LastName |
| Group name | Groups |
```

I have a patch ready that can be applied to fix this issue.