Fix arrowhead syntax in sequenceDiagram.md

[zhanghailing]

docs/sequenceDiagram.md arrowhead syntax

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✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 3.52%. Comparing base (277c496) to head (c48562d).

Additional details and impacted files

@@           Coverage Diff           @@
##           develop   #7485   +/-   ##
=======================================
  Coverage     3.52%   3.52%           
=======================================
  Files          509     509           
  Lines        49790   49790           
  Branches       785     785           
=======================================
  Hits          1754    1754           
  Misses       48036   48036           

Flag	Coverage Δ
unit	3.52% <ø> (ø)

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