docs(tooltip): removed center variants

[micahjones13]

Brief Description

Removes the tooltip placement 'center' variants from SB. This includes

• top center
• bottom center
• right center
• left center These placements don't exist anymore. Instead they are just 'top', 'bottom', ect.

JIRA Link

https://rocketcom.atlassian.net/browse/ASTRO-6725

Related Issue

General Notes

Motivation and Context

Issues and Limitations

Types of changes

• [ ] Bug fix
• [ ] New feature
• [ ] Breaking change

Checklist

• [ ] This PR adds or removes a Storybook story.
• [ ] I have added tests to cover my changes.
• [ ] Regressions are passing and/or failures are documented
• [ ] Changes have been checked in evergreen browsers

[changeset-bot[bot]]

⚠️ No Changeset found

Latest commit: f68fd32a4c5eac8aea8981e1e5acb27f100a8781

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[micahjones13]

changeset && g2g

I don't think this needs a changeset since it's just a docs change. The ${side}-center placements never actually existed. Like bottom-center was never a valid placement, so idk what they were doing here 🤷