docs: add missing timeline changeset

[micahjones13]

Brief Description

Adds a changest for the timeline playhead indicator prop.

JIRA Link

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]]

🦋 Changeset detected

Latest commit: 219464e20865553bbd1c8bc9d02a7007a9fc365d

The changes in this PR will be included in the next version bump.

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[netlify[bot]]

✅ Deploy Preview for astro-stencil canceled.

Name	Link
🔨 Latest commit	219464e20865553bbd1c8bc9d02a7007a9fc365d
🔍 Latest deploy log	https://app.netlify.com/sites/astro-stencil/deploys/652ea0e5e94124000a5e653b

[netlify[bot]]

✅ Deploy Preview for astro-preview canceled.

Name	Link
🔨 Latest commit	219464e20865553bbd1c8bc9d02a7007a9fc365d
🔍 Latest deploy log	https://app.netlify.com/sites/astro-preview/deploys/652ea0e5a7e7750008f77507