Use plural variables consistently (github#20412)

* Use plural variables consistently

* Update content/developers/github-marketplace/github-marketplace-overview/about-github-marketplace.md

Author: hubwriter

content/actions/creating-actions/about-actions.md

@@ -151,7 +151,7 @@ We recommend creating a README file to help people learn how to use your action.
 
 ### Strengths of GitHub Actions and GitHub Apps
 
-While both {% data variables.product.prodname_actions %} and {% data variables.product.prodname_github_app %}s provide ways to build automation and workflow tools, they each have strengths that make them useful in different ways.
+While both {% data variables.product.prodname_actions %} and {% data variables.product.prodname_github_apps %} provide ways to build automation and workflow tools, they each have strengths that make them useful in different ways.
 
 {% data variables.product.prodname_github_apps %}:
 * Run persistently and can react to events quickly.

content/code-security/secure-coding/integrating-with-code-scanning/about-integration-with-code-scanning.md

@@ -28,7 +28,7 @@ If you use a third-party static analysis tool that can produce results as Static
 
 ## Integrations with webhooks
 
-You can use {% data variables.product.prodname_code_scanning %} webhooks to build or set up integrations, such as [{% data variables.product.prodname_github_app %}s](/apps/building-github-apps/) or [{% data variables.product.prodname_oauth_app %}s](/apps/building-oauth-apps/), that subscribe to {% data variables.product.prodname_code_scanning %} events in your repository. For example, you could build an integration that creates an issue on {% data variables.product.product_name %} or sends you a Slack notification when a new {% data variables.product.prodname_code_scanning %} alert is added in your repository. For more information, see "[Creating webhooks](/developers/webhooks-and-events/creating-webhooks)" and "[Webhook events and payloads](/developers/webhooks-and-events/webhook-events-and-payloads#code_scanning_alert)."
+You can use {% data variables.product.prodname_code_scanning %} webhooks to build or set up integrations, such as [{% data variables.product.prodname_github_apps %}](/apps/building-github-apps/) or [{% data variables.product.prodname_oauth_apps %}](/apps/building-oauth-apps/), that subscribe to {% data variables.product.prodname_code_scanning %} events in your repository. For example, you could build an integration that creates an issue on {% data variables.product.product_name %} or sends you a Slack notification when a new {% data variables.product.prodname_code_scanning %} alert is added in your repository. For more information, see "[Creating webhooks](/developers/webhooks-and-events/creating-webhooks)" and "[Webhook events and payloads](/developers/webhooks-and-events/webhook-events-and-payloads#code_scanning_alert)."
 
 ## Further reading