fix: change casing of internal blog post link (#18487)

## DESCRIBE YOUR PR

Small change in casing of link.

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## PRE-MERGE CHECKLIST

*Make sure you've checked the following before merging your changes:*

- [ ] Checked Vercel preview for correctness, including links
- [ ] PR was reviewed and approved by any necessary SMEs (subject matter
experts)
- [ ] PR was reviewed and approved by a member of the [Sentry docs
team](https://github.com/orgs/getsentry/teams/docs)

Author: philprime

develop-docs/sdk/getting-started/playbooks/coordination/managing-linear-projects.mdx

@@ -162,7 +162,7 @@ Use this template as a starting point for the project description. For cross-SDK
 - [ ] [Sentry Product Blog](https://blog.sentry.io/) post
 - [ ] [Sentry Changelog](https://sentry.io/changelog/) entry
 - [ ] [Sentry Engineering Blog](https://sentry.engineering/blog) post
-- [ ] [internal blog post](https://vanguard.getsentry.net/)
+- [ ] [Internal Blog Post](https://vanguard.getsentry.net/)
 - [ ] S&T video
 
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