Update unit-testing-mstest-migration-from-v1-to-v3.md

Author: engyebrahim

docs/core/testing/unit-testing-mstest-migration-from-v1-to-v3.md

@@ -170,9 +170,11 @@ public async Task TestMethod() { ... }
 ```
 
 ## Configuration changes
+
 MSTest v3 supports both XML and JSON formats for configuration files.
 
 1. **Verify Configurations**: Ensure that `.runsettings` files align with MSTest v3 syntax and structure.
+
 ## Parallel execution and performance optimization
 
 Configure parallel execution in _.runsettings_ to improve performance.