(AzureCXP) Fix Readability

Based on the customer feedback on below thread , corrected the sentence for readability. 
https://github.com/MicrosoftDocs/azure-docs/issues/50830

Author: BharathNimmala-MSFT

articles/azure-functions/functions-monitoring.md

@@ -13,7 +13,7 @@ ms.date: 04/04/2019
 
 We recommend using Application Insights because it collects log, performance, and error data. It automatically detects performance anomalies and includes powerful analytics tools to help you diagnose issues and to understand how your functions are used. It's designed to help you continuously improve performance and usability. You can even use Application Insights during local function app project development. For more information, see [What is Application Insights?](../azure-monitor/app/app-insights-overview.md).
 
-As the required Application Insights instrumentation is built into Azure Functions, all you need is a valid instrumentation key to connect your function app to an Application Insights resource. The instrumentation key should be added to your application settings when your function app resource is created in Azure. If your function app doesn't already this key, you can [set it manually](#enable-application-insights-integration).  
+As the required Application Insights instrumentation is built into Azure Functions, all you need is a valid instrumentation key to connect your function app to an Application Insights resource. The instrumentation key should be added to your application settings when your function app resource is created in Azure. If your function app doesn't already have this key, you can [set it manually](#enable-application-insights-integration).  
 
 ## Application Insights pricing and limits