Add Redshift behavior change: restrict_direct_pg_catalog_access

[jtcohen6]

What are you changing in this pull request and why?

Add behavior flag referenced in dbt-labs/dbt-redshift#899

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.

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Name	Status	Preview	Updated (UTC)
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[mirnawong1]

hey @jtcohen6 , made some small tweaks for conciseness and added a super small intro sentence after the h2 'adapter specific behavior change' header so there's some context.

I've approved it and happy to merge for you if you're happy with them!

[jtcohen6]

Thanks @mirnawong1, this is great! The team can follow up later today with more details or fast-follow edits as appropriate.