fix: Update ddsv6-series.md to note that Ephemeral Disks *are* Supported

[vsabella]

It looks like there is a doc typo, ephemeral OS disks are supported for this sku, per the following command

~ az vm list-skus -l westus --size Standard_D8ds_v6
[
  {
    "apiVersions": null,
    "capabilities": [
      {
        "name": "MaxResourceVolumeMB",
        "value": "0"
      },
      {
        "name": "OSVhdSizeMB",
        "value": "1047552"
      },
      {
        "name": "vCPUs",
        "value": "8"
      },
      {
        "name": "MemoryPreservingMaintenanceSupported",
        "value": "True"
      },
      {
        "name": "HyperVGenerations",
        "value": "V2"
      },
      {
        "name": "DiskControllerTypes",
        "value": "NVMe"
      },
      {
        "name": "SupportedEphemeralOSDiskPlacements",
        "value": "NvmeDisk"
      },
      {
        "name": "MemoryGB",
        "value": "32"
      },
      {
        "name": "MaxDataDiskCount",
        "value": "24"
      },
      {
        "name": "CpuArchitectureType",
        "value": "x64"
      },
      {
        "name": "LowPriorityCapable",
        "value": "True"
      },
      {
        "name": "PremiumIO",
        "value": "True"
      },
      {
        "name": "VMDeploymentTypes",
        "value": "IaaS"
      },
      {
        "name": "vCPUsAvailable",
        "value": "8"
      },
      {
        "name": "vCPUsPerCore",
        "value": "2"
      },
      {
        "name": "CombinedTempDiskAndCachedIOPS",
        "value": "36000"
      },
      {
        "name": "CombinedTempDiskAndCachedReadBytesPerSecond",
        "value": "500000000"
      },
      {
        "name": "CombinedTempDiskAndCachedWriteBytesPerSecond",
        "value": "500000000"
      },
      {
        "name": "UncachedDiskIOPS",
        "value": "12800"
      },
      {
        "name": "UncachedDiskBytesPerSecond",
        "value": "424000000"
      },
      {
        "name": "NvmeDiskSizeInMiB",
        "value": "450560"
      },
      {
        "name": "NvmeSizePerDiskInMiB",
        "value": "450560"
      },
      {
        "name": "NvmeMaxReadIops",
        "value": "150000"
      },
      {
        "name": "NvmeMaxWriteIops",
        "value": "60000"
      },
      {
        "name": "NvmeMaxReadBytesPerSecond",
        "value": "720000000"
      },
      {
        "name": "NvmeMaxWriteBytesPerSecond",
        "value": "360000000"
      },
      {
        "name": "EphemeralOSDiskSupported",
        "value": "True"
      },

[prmerger-automator]

@vsabella : Thanks for your contribution! The author(s) have been notified to review your proposed change.

[learn-build-service-prod]

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[v-dirichards]

@mattmcinnes

Can you review the proposed changes?

Important: When the changes are ready for publication, adding a #sign-off comment is the best way to signal that the PR is ready for the review team to merge.

#label:"aq-pr-triaged"
@MicrosoftDocs/public-repo-pr-review-team