Doc issues with Common API Policy import/export

[ashera96]

Description:
Under doc [1], step 2 the export policy command is faulty as the version which is a required field is not provided under the command template. Also the example needs to have the version field.

[1] https://apim.docs.wso2.com/en/latest/install-and-setup/setup/api-controller/managing-common-api-policies/migrating-common-api-policies-to-different-environments/#export-a-common-api-policy