Update nc-a100-v4-series.md

I noticed a small typo on Ubuntu when reading the page 👍

Author: CalvinHartwell

articles/virtual-machines/nc-a100-v4-series.md

@@ -35,7 +35,7 @@ To get started with NC A100 v4 VMs, refer to [HPC Workload Configuration and Opt
 
 Due to increased GPU memory I/O footprint, the NC A100 v4 requires the use of [Generation 2 VMs](generation-2.md) and marketplace images. While the [Azure HPC images](configure.md) are strongly recommended, Azure HPC Ubuntu 18.04, 20.04 and Azure HPC CentOS 7.9, CentOS 8.4, RHEL 7.9, RHEL 8.5, Windows Service 2019, and Windows Service 2022 images are supported.
 
-Note: The Unbuntu-HPC 18.04-ncv4 image is only valid during preview and deprecated on 7/29/2022.  All changes have been merged into standard Ubuntu-HPC 18.04 image. Please follow instruction [Azure HPC images](configure.md) for configuration.
+Note: The Ubuntu-HPC 18.04-ncv4 image is only valid during preview and deprecated on 7/29/2022.  All changes have been merged into standard Ubuntu-HPC 18.04 image. Please follow instruction [Azure HPC images](configure.md) for configuration.
 
 
 - [Premium Storage](premium-storage-performance.md): Supported