The document 'Example_Transaction.md' may be better.

[XiaoyiPeng]

BUG REPORT

1. Please describe the issue you observed:

   I) : The transaction states in the document should be as consistent as possible with the states predefined in the code.

II): MQ Server may query clients by producerGroup of producers instead of IDs, the described here in this document should be corrected.

2. Please tell us about your environment:

   OS: Windows10
   branch: develop