azure-storage-file-datalake Readme issues

[v-xuto]

Section Link:

Reason:
All three correspond to the same link 'Azure Portal'.

Suggestion:
Update these link:
Azure Portal: https://docs.microsoft.com/azure/storage/common/storage-quickstart-create-account?tabs=azure-portal,
Azure PowerShell: https://docs.microsoft.com/azure/storage/common/storage-quickstart-create-account?tabs=azure-powershell,
Azure CLI: https://docs.microsoft.com/azure/storage/common/storage-quickstart-create-account?tabs=azure-cli
2.
Section Link:

Reason:
az: error: unrecognized arguments: --hierarchical-namespace true

Suggestion:

# Install the extension “Storage-Preview”
az extension add --name storage-preview
# Create the storage account
az storage account create -n my-storage-account-name -g my-resource-group --sku Standard_LRS --kind StorageV2 --hierarchical-namespace true

[v-xuto]

@jongio please review.

[mayurid]

@xiafu-msft and @amishra-dev to help triage

[jongio]

According to this, https://github.com/MicrosoftDocs/azure-docs/issues/24481, it looks like a CLI extension is required.

[v-xuto]

@jongio, Thank you for your advice. I've updated it.

[v-xuto]

PR merged.