Update extension-supported-os.md

Author: przlplx

support/azure/virtual-machines/windows/extension-supported-os.md

@@ -6,7 +6,7 @@ ms.reviewer:
 ms.service: azure-virtual-machines
 ms.custom: sap:VM Extensions not operating correctly
 ---
-# Azure Extension supported operating systems
+# Azure extensions-supported operating systems
 
 **Applies to:** :heavy_check_mark: Linux VMs :heavy_check_mark: Windows VMs
 
@@ -15,14 +15,14 @@ _Original KB number:_   4078134
 
 [!INCLUDE [VM assist troubleshooting tools](~/includes/azure/vmassist-include.md)]
 
-VM Extensions enable post-deployment configuration of VM, such as installing and configuring software. VM extensions also enable recovery features such as resetting the administrative password of a VM. Without the Azure VM Agent, VM extensions cannot be run.
+VM extensions enable post-deployment configuration of a virtual machine (VM), including installing and configuring software. VM extensions also enable recovery features, such as resetting the administrative password of a VM. Without the Azure VM Agent, VM extensions can't be run.
 
-* The Windows VM Agent needs at least Windows Server 2008 SP2 (64-bit) to run, with the .NET Framework 4.0.
-* The Linux agent runs on [multiple OSes](/azure/virtual-machines/extensions/agent-linux#requirements), however the extensions framework has a limit for the OSes that support extensions.
+* In order to run, the Windows VM Agent requires at least Windows Server 2008 SP2 (64-bit) and .NET Framework 4.0.
+* The Linux agent runs on [multiple OSes](/azure/virtual-machines/extensions/agent-linux#requirements). However, the extensions framework has a limit for the OSes that support extensions.
 
-Some extensions are not supported across all OSes and may emit Error Code 51, 'Unsupported OS'. Check the individual extension documentation for supportability.
+Some extensions are not supported across all OSes. They might return Error Code 51, 'Unsupported OS'. Check the individual extension documentation for supportability.
 
-For a discussion of Windows and Linux extensions and how to troubleshoot extensions, see [Azure virtual machine extensions and features](/azure/virtual-machines/extensions/overview).
+For a discussion about Windows and Linux extensions and how to troubleshoot extensions, see [Azure virtual machine extensions and features](/azure/virtual-machines/extensions/overview).
 
 Further troubleshooting guidance can be found at: