New-AzDiskConfig.md: fixed a copy-pasto (#20514)

Fixed a copy-pasto in the description of the -DiskMBpsReadOnly option.

Author: bahrep

src/Compute/Compute/help/New-AzDiskConfig.md

@@ -253,7 +253,7 @@ Accept wildcard characters: False
 ```
 
 ### -DiskMBpsReadOnly
-"description": "The total throughput (MBps) that will be allowed across all VMs mounting the shared disk as ReadOnly. MBps means millions of bytes per second - MB here uses the ISO notation, of powers of 10.
+The total throughput (MBps) that will be allowed across all VMs mounting the shared disk as ReadOnly. MBps means millions of bytes per second - MB here uses the ISO notation, of powers of 10.
 
 ```yaml
 Type: System.Int64