[CT-2332] [CT-2330] [Bug] Documentation for csv files is not displaying the table name in the Example SQL section

### Is this a new bug in dbt-core?

- [X] I believe this is a new bug in dbt-core
- [X] I have searched the existing issues, and I could not find an existing issue for this bug

### Current Behavior

after running dbt docs serve, the documentation tied to a seed csv file is not showing the table name in the example SQL section. Instead of the table name, it is displaying undefined.

### Expected Behavior

The table name should be displayed in the section Example SQL

### Steps To Reproduce

1. Create documentation for a seed file
2. dbt docs generate
3. dbt docs serve
4. Navigate to the seed documentation
5. Check what's in the section Example SQL

### Relevant log output

_No response_

### Environment

```markdown
- OS: Mac OS monterrey 12.5.1
- Python: Python 3.8.9
- dbt: 1.3.1
```

### Which database adapter are you using with dbt?

postgres

### Additional Context

_No response_