fix readme (Azure#30417)

Author: msyyc

sdk/rdbms/azure-mgmt-rdbms/README.md

@@ -36,11 +36,11 @@ With above configuration, client can be authenticated by following code:
 
 ```python
 from azure.identity import DefaultAzureCredential
-from azure.mgmt.rdbms import 
+from azure.mgmt.rdbms.mysql import MySQLManagementClient
 import os
 
 sub_id = os.getenv("AZURE_SUBSCRIPTION_ID")
-client = (credential=DefaultAzureCredential(), subscription_id=sub_id)
+client = MySQLManagementClient(credential=DefaultAzureCredential(), subscription_id=sub_id)
 ```
 
 ## Examples

sdk/rdbms/azure-mgmt-rdbms/sdk_packaging.toml

@@ -2,4 +2,6 @@
 package_name = "azure-mgmt-rdbms"
 package_pprint_name = "RDBMS Management"
 package_doc_id = ""
-is_stable = true
+is_stable = false
+title = "MySQLManagementClient"
+sub_namespace = "mysql"

sdk/rdbms/azure-mgmt-rdbms/setup.py

@@ -47,7 +47,7 @@
     url='https://github.com/Azure/azure-sdk-for-python',
     keywords="azure, azure sdk",  # update with search keywords relevant to the azure service / product
     classifiers=[
-        'Development Status :: 5 - Production/Stable',
+        'Development Status :: 4 - Beta',
         'Programming Language :: Python',
         'Programming Language :: Python :: 3 :: Only',
         'Programming Language :: Python :: 3',