Fixed Angular example for Custom Build Command

Using `ng build --prod` as a custom build command for an Angular project doesn't work since the Angular CLI isn't installed globally. This solution *does* work.

Author: rickvdbosch

articles/static-web-apps/github-actions-workflow.md

@@ -145,7 +145,7 @@ The deployment always calls `npm install` before any custom command.
 
 | Command            | Description |
 |---------------------|-------------|
-| `app_build_command` | Defines a custom command to run during deployment of the static content application.<br><br>For example, to configure a production build for an Angular application enter `ng build --prod`. If left blank, the workflow tries to run the `npm run build` or `npm run build:Azure` commands.  |
+| `app_build_command` | Defines a custom command to run during deployment of the static content application.<br><br>For example, to configure a production build for an Angular application create an npm script named `build-prod` to run `ng build --prod` and enter `npm run build-prod` as the custom command. If left blank, the workflow tries to run the `npm run build` or `npm run build:Azure` commands.  |
 | `api_build_command` | Defines a custom command to run during deployment of the Azure Functions API application. |
 
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