EXCLUDE COLLATE in CREATE/ALTER TABLE document

[shihao zhong]

Hi hackers,

I hope this email finds you well.

I noticed that the CREATE/ALTER TABLE document does not mention that
EXCLUDE can accept a collation. I created a documentation fix for this
issue, and I have attached it to this email.

Please let me know if you have any questions or concerns.

Thanks,
Shihao

update_document_exclude_with_collate.patch
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