[type:fix] fix lack separator of path of ApiDoc

[tian-pengfei]

Make sure that:

• You have read the contribution guidelines.
• You submit test cases (unit or integration tests) that back your changes.
• Your local test passed ./mvnw clean install -Dmaven.javadoc.skip=true.

fix #4527

before:

after:

[codecov-commenter]

Codecov Report

Merging #4528 (9bdc045) into master (4491cb8) will decrease coverage by 0.04%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #4528      +/-   ##
============================================
- Coverage     68.46%   68.43%   -0.04%     
+ Complexity     7631     7623       -8     
============================================
  Files          1028     1028              
  Lines         29440    29440              
  Branches       2666     2666              
============================================
- Hits          20157    20147      -10     
- Misses         7690     7698       +8     
- Partials       1593     1595       +2     

see 3 files with indirect coverage changes

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