fix document typo in SlaveActingMasterMode.md

[maclong1989]

fix document typo in SlaveActingMasterMode.md.Change RoccketMQ to RocketMQ.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 47.22%. Comparing base (8859093) to head (7eec0ed).
Report is 2 commits behind head on develop.

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #8575      +/-   ##
=============================================
+ Coverage      47.20%   47.22%   +0.02%     
- Complexity     11412    11442      +30     
=============================================
  Files           1275     1275              
  Lines          89110    89242     +132     
  Branches       11468    11470       +2     
=============================================
+ Hits           42061    42146      +85     
- Misses         41873    41891      +18     
- Partials        5176     5205      +29     

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