[ISSUE #8245]Fix typo in user_guide.md

[liuzc9]

Fix typo 'message' in user_guide.md

[RongtongJin]

It would be better to submit a relevant issue first @liuzc9

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 42.90%. Comparing base (144b22b) to head (229b08e).
Report is 144 commits behind head on develop.

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #8244      +/-   ##
=============================================
- Coverage      42.92%   42.90%   -0.03%     
+ Complexity     10383    10381       -2     
=============================================
  Files           1271     1271              
  Lines          88785    88785              
  Branches       11408    11408              
=============================================
- Hits           38112    38091      -21     
- Misses         45973    45988      +15     
- Partials        4700     4706       +6     

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[liuzc9]

I submitted a new issue with #8245