Example not working with `azidentity.NewDefaultAzureCredential(nil)`

### This issue is for a: (mark with an `x`)
```
- [x] bug report -> please search issues before submitting
- [ ] feature request
- [ ] documentation issue or request
- [ ] regression (a behavior that used to work and stopped in a new release)
```

### Minimal steps to reproduce
Run the example as documented in the README:
* create the storange account
* edit `storage-quickstart.go` by replacing the `` with the actual name to be used
* `az login`
* go run storage-quickstart.go

### Any log messages given by the failure
```
# go run storage-quickstart.go
Azure Blob storage quick start sample
Creating a container named quickstart-4817313775875140775
Creating a dummy file to test the upload and download
2022/05/06 13:24:35 Failure to upload to blob: ===== RESPONSE ERROR (ErrorCode=AuthorizationPermissionMismatch) =====
Description=This request is not authorized to perform this operation using this permission.
RequestId:8d3546a9-e01e-0063-453b-61bd38000000
Time:2022-05-06T11:24:15.5872142Z, Details: (none)
exit status 1
```
### Expected/desired behavior
```
# go run storage-quickstart.go
Azure Blob storage quick start sample
Creating a container named quickstart-7859879233567791186
Creating a dummy file to test the upload and download
Listing the blobs in the container:
https://aoeuaoeuaoeuaoeu.blob.core.windows.net/quickstart-7859879233567791186/quickstartblob-7024034036063403663

hello world this is a blob

Press enter key to delete the blob fils, example container, and exit the application.

Cleaning up.
Deleting the blob quickstartblob-7024034036063403663
Deleting the blob quickstart-7859879233567791186
```

### OS and Version?
Arch Linux, current

### Versions
`master` branch

### Mention any other details that might be useful
I have tried various things to get Blob access working with `azidentity.NewDefaultAzureCredential(nil)` but failed miserably (I am logged in as owner on the root management group, so the permissions should be all set). There is also a section in the README.md that suggest to take note of the _storage account name_ as well as the _storage account key_ for later use. However they are not used anymore in the quickstart.

The thing I got working is to replace the `credentials, err := azidentity.NewDefaultAzureCredential(nil)` with the following:

```golang
accountName, ok := os.LookupEnv("AZURE_STORAGE_ACCOUNT_NAME")
if !ok {
panic(errors.New("AZURE_STORAGE_ACCOUNT_NAME could not be found"))
}
accountKey, ok := os.LookupEnv("AZURE_STORAGE_ACCOUNT_KEY")
if !ok {
panic(errors.New("AZURE_STORAGE_ACCOUNT_KEY could not be found"))
}
credential, err := azblob.NewSharedKeyCredential(accountName, accountKey)
```

... and then...

```golang
serviceClient, err := azblob.NewServiceClientWithSharedKey(url, credential, nil)
// ...
blobClient := containerClient.NewBlockBlobClient(url + containerName + "/" + blobName)
```

... instead of...

```golang
serviceClient, err := azblob.NewServiceClient(url, credential, nil)
// ...
blobClient, err := azblob.NewBlockBlobClient(url+containerName+"/"+blobName, credential, nil)
if err != nil {
log.Fatal(err)
}
```