chore: fix typo

Author: gregberge

articles/run-argos-on-vercel-preview/index.mdx

@@ -15,7 +15,7 @@ Argos now offers a smooth integration with Vercel Preview for visual testing, en
 
 ## The Benefits of Visual Testing with Vercel Preview
 
--**Cost Efficiency in CI**: Eliminate the need for duplicate application builds, saving time and resources.
+- **Cost Efficiency in CI**: Eliminate the need for duplicate application builds, saving time and resources.
 
 - **Enhanced Test Reliability**: Run visual tests in an environment that mirrors production, ensuring consistency and accuracy.