Update collect-custom-metrics-linux-telegraf.md

Updates related to User Story 1654320: https://mseng.visualstudio.com/TechnicalContent/_workitems/edit/1654320

Author: john-par

articles/azure-monitor/platform/collect-custom-metrics-linux-telegraf.md

@@ -1,6 +1,6 @@
 ---
 title: Collect custom metrics for Linux VM with the InfluxData Telegraf agent
-description: instructions on how to deploy the InfluxData Telegraf agent on a Linux VM in Azure and configure the agent to publish metrics to Azure Monitor. 
+description: Instructions on how to deploy the InfluxData Telegraf agent on a Linux VM in Azure and configure the agent to publish metrics to Azure Monitor. 
 author: anirudhcavale
 services: azure-monitor
 ms.service: azure-monitor