Fix comments for javadocs

[longquanzheng]

No description provided.

[codecov]

Codecov Report

Merging #197 (32f6960) into main (b2c3988) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main     #197   +/-   ##
=========================================
  Coverage     70.85%   70.85%           
  Complexity      361      361           
=========================================
  Files            59       59           
  Lines          1527     1527           
  Branches        132      132           
=========================================
  Hits           1082     1082           
  Misses          374      374           
  Partials         71       71           

Files Changed	Coverage Δ
...rc/main/java/io/iworkflow/core/ObjectWorkflow.java	100.00% <ø> (ø)
src/main/java/io/iworkflow/core/WorkflowState.java	72.72% <ø> (ø)

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