Clarification of pauses for maintenance

Added clarification that maintenance pause for GP is less than 10 seconds except for the rare case that occurs about every 18 months that requires a longer period of around 30 seconds.

Author: Drewm3

articles/virtual-machines/maintenance-and-updates.md

@@ -28,7 +28,7 @@ Within a VM, you can get notifications about upcoming maintenance by [using Sche
 
 Most platform updates don't affect customer VMs. When a no-impact update isn't possible, Azure chooses the update mechanism that's least impactful to customer VMs. 
 
-Most nonzero-impact maintenance pauses the VM for less than 10 seconds. In certain cases, Azure uses memory-preserving maintenance mechanisms. These mechanisms pause the VM, typically for about 30 seconds, and preserve the memory in RAM. The VM is then resumed, and its clock is automatically synchronized. 
+When VM impacting maintenance is required it will almost always be completed through a VM pause for less than 10 seconds. In rare circumstances, no more than once every 18 months for general purpose VM sizes, Azure uses a mechanism that will pause the VM for about 30 seconds. After any pause operation the VM clock is automatically synchronized upon resume. 
 
 Memory-preserving maintenance works for more than 90 percent of Azure VMs. It doesn't work for G, M, N, and H series. Azure increasingly uses live-migration technologies and improves memory-preserving maintenance mechanisms to reduce the pause durations.