This is the document in question: src/KeyVault/KeyVault/help/Remove-AzKeyVaultManagedStorageSasDefinition.md

It's about the command Remove-AzKeyVaultManagedStorageSasDefinition
But the examples are using Remove-AzKeyVaultManagedStorage.

That'll cause confusion.
This is the screenshot of get-help Remove-AzKeyVaultManagedStorageSasDefinition
The command of the examples are wrong.