Update small grammer error in understanding-github-actions.md

Author: feanil

content/actions/learn-github-actions/understanding-github-actions.md

@@ -30,7 +30,7 @@ topics:
 
 ## The components of {% data variables.product.prodname_actions %}
 
-You can configure a {% data variables.product.prodname_actions %} _workflow_ to be triggered when an _event_ occurs in your repository, such as a pull request being opened or an issue being created.  Your workflow contains one or more _jobs_ which can run in sequential order or in parallel.  Each job will run inside its own virtual machine _runner_, or inside a container, and has one or more _steps_ that either run a script that you define or run an _action_, which is a reusable extension that can simplify in your workflow.
+You can configure a {% data variables.product.prodname_actions %} _workflow_ to be triggered when an _event_ occurs in your repository, such as a pull request being opened or an issue being created.  Your workflow contains one or more _jobs_ which can run in sequential order or in parallel.  Each job will run inside its own virtual machine _runner_, or inside a container, and has one or more _steps_ that either run a script that you define or run an _action_, which is a reusable extension that can simplify your workflow.
 
 ![Workflow overview](/assets/images/help/images/overview-actions-simple.png)