chore: updated docs on display column id

[risalfajar]

Sorry, I forgot to update the docs for DiplayColumn's id before.

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
svelte-headless-table	❌ Failed (Inspect)			Apr 8, 2023 9:04am

[coveralls]

Pull Request Test Coverage Report for Build 4644397972

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 78.66%

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Totals
Change from base Build 4630164601:	0.0%
Covered Lines:	748
Relevant Lines:	914

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💛 - Coveralls

[bryanmylee]

No worries, my version of KitDocs is out of date and can no longer be deployed on Vercel. I'm on the painful task of trying to migrate it and get it working again, so I'll merge this after that!