Fix formatting for macOS installation commands

Author: jonburchel

articles/ai-foundry/foundry-local/get-started.md

@@ -58,10 +58,10 @@ Get started fast with Foundry Local:
      winget install Microsoft.FoundryLocal
      ```
    - **macOS**: Open a terminal and run the following command:
-     `bash
-brew tap microsoft/foundrylocal
-brew install foundrylocal
-`
+     ```bash
+     brew tap microsoft/foundrylocal
+     brew install foundrylocal
+     ```
      Alternatively, you can download the installer from the [Foundry Local GitHub repository](https://aka.ms/foundry-local-installer).
 
 1. **Run your first model**. Open a terminal and run this command: