add changes earlier in doc

Author: hhunter-ms

articles/azure-monitor/observability-data.md

@@ -11,14 +11,14 @@ ms.date: 08/18/2022
 # Observability data in Azure Monitor
 Enabling observability across today's complex computing environments running distributed applications that rely on both cloud and on-premises services, requires collection of operational data from every layer and every component of the distributed system. You need to be able to perform deep insights on this data and consolidate it into a single pane of glass with different perspectives to support the multitude of stakeholders in your organization.
 
-[Azure Monitor](overview.md) collects and aggregates data from a variety of sources into a common data platform where it can be used for analysis, visualization, and alerting. It provides a consistent experience on top of data from multiple sources, which gives you deep insights across all your monitored resources and even with data from other services that store their data in Azure Monitor.
+[Azure Monitor](overview.md) collects and aggregates data from various sources into a common data platform where it can be used for analysis, visualization, and alerting. It provides a consistent experience on top of data from multiple sources, which gives you deep insights across all your monitored resources and even with data from other services that store their data in Azure Monitor.
 
 
 :::image type="content" source="media/overview/azure-monitor-overview-optm.svg" alt-text="Diagram that shows an overview of Azure Monitor." border="false" lightbox="media/overview/azure-monitor-overview-optm.svg":::
 
 ## Pillars of observability
 
-Metrics, logs, and distributed traces are commonly referred to as the three pillars of observability. These are the different kinds of data that a monitoring tool must collect and analyze to provide sufficient observability of a monitored system. Observability can be achieved by correlating data from multiple pillars and aggregating data across the entire set of resources being monitored. Because Azure Monitor stores data from multiple sources together, the data can be correlated and analyzed using a common set of tools. It also correlates data across multiple Azure subscriptions and tenants, in addition to hosting data for other services.
+Metrics, logs, distributed traces, and changes are commonly referred to as the pillars of observability. These are the different kinds of data that a monitoring tool must collect and analyze to provide sufficient observability of a monitored system. Observability can be achieved by correlating data from multiple pillars and aggregating data across the entire set of resources being monitored. Because Azure Monitor stores data from multiple sources together, the data can be correlated and analyzed using a common set of tools. It also correlates data across multiple Azure subscriptions and tenants, in addition to hosting data for other services.
 
 Azure resources generate a significant amount of monitoring data. Azure Monitor consolidates this data along with monitoring data from other sources into either a Metrics or Logs platform. Each is optimized for particular monitoring scenarios, and each supports different features in Azure Monitor. Features such as data analysis, visualizations, or alerting require you to understand the differences so that you can implement your required scenario in the most efficient and cost effective manner. Insights in Azure Monitor such as [Application Insights](app/app-insights-overview.md) or [VM insights](vm/vminsights-overview.md) have analysis tools that allow you to focus on the particular monitoring scenario without having to understand the differences between the two types of data.