Fix capitalization in file search instructions

Author: JamesJBarnett

articles/ai-services/agents/how-to/tools/file-search.md

@@ -86,7 +86,7 @@ As a fallback, there's a 60-second maximum wait in the run object when the threa
 
 ## Add file search to an agent using the Azure AI Foundry portal
 
-you can add the Bing Search tool to an agent programatically using the code examples listed at the top of this article, or the Azure AI Foundry portal. If you want to use the portal:
+You can add the Bing Search tool to an agent programatically using the code examples listed at the top of this article, or the Azure AI Foundry portal. If you want to use the portal:
 
 1. In the **Create and debug** screen for your agent, scroll down the **Setup** pane on the right to **knowledge**. Then select **Add**.