Incomplete cmdlet description when it consists of multiple APIs

## Problem

If a cmdlet consists of more than one APIs (for example, [`Get-AzDatabricksWorkspace`](https://learn.microsoft.com/en-us/powershell/module/az.databricks/get-azdatabricksworkspace?view=azps-8.3.0) can do get and list), the description of the cmdlet will just use the description of the first API, which is misleading.


## Expected result

Cmdlet descritpion should contain the descriptions of all the APIs that it's made of. For example:

> This cmdlet is capable of:
> 1. Gets a workspace
> 2. Lists all the workspaces under a subscription

or

> This cmdlet gets a workspace, or lists all the workspaces under a subscription.