Update .maintainers_guide.md

Author: PranayAgarwal

.maintainers_guide.md

@@ -38,7 +38,8 @@ To push a new release, follow these steps:
 4. Once the release is published, a new Github build will automatically start.
    Ensure that the build passes and a new `vscode-hack-[version].vsix` is added
    as an asset to the GitHub release page.
-5. Publish the new version to the VS Code marketplace.
+5. Publish the new version to the VS Code Marketplace. This can only be done
+   from Pranay Agarwal's Microsoft account.
 
 ## Workflow