Fix content type header in 2.8 release blog

Author: marko-hologram

docs/site/content/blog/2-8.mdx

@@ -126,7 +126,7 @@ We've retooled this site to enable agents and AI-assisted humans to work more ef
 
 We've improved your agents' ability to fetch docs from our site in a number of ways:
 
-- **Markdown responses for agents**: By responding with Markdown (instead of HTML), we help to preserve your context window. No configuration or special instructions are required. Run `curl -sL -H "Accept: text-markdown" https://turborepo.dev/repo/docs` in your terminal to see an example response.
+- **Markdown responses for agents**: By responding with Markdown (instead of HTML), we help to preserve your context window. No configuration or special instructions are required. Run `curl -sL -H "Accept: text/markdown" https://turborepo.dev/repo/docs` in your terminal to see an example response.
 - **.md routes**: You can also visit a markdown version of any documentation page by appending `.md` to a route. For example, try https://turborepo.dev/docs.md.
 - **/sitemap.md**: A machine-readable sitemap is available at https://turborepo.dev/sitemap.md, allowing agents to find out what docs exist.
 - **Versioned documentation**: Starting with version 2.7.6 of Turborepo, versioned docs are now available on subdomains of `turborepo.dev`. [Visit the 2.7.6 documentation here](https://v2-7-6.turborepo.dev/docs).