Modified azure-sdk-for-python/sdk/keyvault/azure-keyvault-keys/samples/key_rotation.py

Updated f-string formatting

Close #18

Before:
print("Key with name '{0}' created with key type '{1}'".format(key.name, key.key_type))

After:
print(f"Key with name '{key.name}' created with key type '{key.key_type}'")

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