update check cols all syntax to be correct

[trouze]

What are you changing in this pull request and why?

This is a really small change to setting your check_cols config in the new yaml snapshot definitions correctly. The old version was syntactically incorrect as putting all in an iterable like

check_cols:
  - all

caused dbt to end up executing the elif block when trying to ascertain the schema shape.

The correct syntax introduced here has dbt execute the correct line instead.

The current syntax leads a user to get the following error as dbt tries to execute this introspective query as it treats all like it's a column name:

select * from (
        select all from (
                select * from database.schema.snapshot
            ) subq
    ) as __dbt_sbq
    where false
    limit 0
20:13:50 Snowflake adapter: Snowflake query id: xxx
20:13:50 Snowflake adapter: Snowflake error: xxx (xxx): xxx: SQL compilation error:
syntax error line 2 at position 19 unexpected 'from'.
20:13:50 Database Error in snapshot snapshot_name (snapshots/snapshot.yml)
  xxx (xxx): xxx: SQL compilation error:
  syntax error line 2 at position 19 unexpected 'from'.

Checklist

• I have reviewed the Content style guide so my content adheres to these guidelines.
• The topic I'm writing about is for specific dbt version(s) and I have versioned it according to the version a whole page and/or version a block of content guidelines.
• I have added checklist item(s) to this list for anything anything that needs to happen before this PR is merged, such as "needs technical review" or "change base branch."
• The content in this PR requires a dbt release note, so I added one to the release notes page.

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🚀 Deployment available! Here are the direct links to the updated files:

• https://docs-getdbt-com-git-trouze-check-cols-all-dbt-labs.vercel.app/reference/resource-configs/check_cols

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