How to list storage blobs is undiscoverable

> ### `az feedback` auto-generates most of the information requested below, as of CLI version 2.0.62

**Related command**

```
az storage blob --help
```

**Describe the bug**
The subgroup `az storage blob directory` is missing from `--help`:

```
» az storage blob --help

Group
az storage blob : Manage object storage for unstructured data (blobs).
Please specify one of the following authentication parameters for your commands: --auth-
mode, --account-key, --connection-string, --sas-token. You also can use corresponding
environment variables to store your authentication credentials, e.g. AZURE_STORAGE_KEY,
AZURE_STORAGE_CONNECTION_STRING and AZURE_STORAGE_SAS_TOKEN.

Subgroups:
copy : Manage blob copy operations. Use `az storage blob show` to check the
status of the blobs.
immutability-policy : Manage blob immutability policy.
incremental-copy : Manage blob incremental copy operations.
lease : Manage storage blob leases.
metadata : Manage blob metadata.
service-properties : Manage storage blob service properties.

Commands:
delete : Mark a blob or snapshot for deletion.
delete-batch : Delete blobs from a blob container recursively.
download : Download a blob to a file path.
download-batch : Download blobs from a blob container recursively.
exists : Check for the existence of a blob in a container.
generate-sas : Generate a shared access signature for the blob.
query [Preview] : Enable users to select/project on blob or blob snapshot data by
providing simple query expressions.
restore : Restore blobs in the specified blob ranges.
rewrite [Preview] : Create a new Block Blob where the content of the blob is read
from a given URL.
set-legal-hold : Set blob legal hold.
set-tier : Set the block or page tiers on the blob.
show : Get the details of a blob.
snapshot : Creates a snapshot of the blob.
sync [Preview] : Sync blobs recursively to a storage blob container.
undelete : Restore soft deleted blob or snapshot.
update : Sets system properties on the blob.
upload : Upload a file to a storage blob.
upload-batch : Upload files from a local directory to a blob container.
url : Create the url to access a blob.

To search AI knowledge base for examples, use: az find "az storage blob"
```

It does work, too:
```
» az storage directory list --help

Command
az storage directory list : List directories in a share.

Arguments
[… snip]
```

**To Reproduce**
Run the command.

**Expected behavior**
Subgroups are fully documented.

**Environment summary**
macOS

**Additional context**