[#2378]fix broken developer documentation link

[liubao68]

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[codecov-commenter]

Codecov Report

Merging #2380 (0f00ece) into master (c7b4f6b) will increase coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #2380   +/-   ##
=========================================
  Coverage     80.29%   80.29%           
  Complexity     1382     1382           
=========================================
  Files          1560     1560           
  Lines         41569    41569           
  Branches       3488     3488           
=========================================
+ Hits          33377    33378    +1     
  Misses         6684     6684           
+ Partials       1508     1507    -1     

Impacted Files	Coverage Δ	Complexity Δ
...ache/servicecomb/foundation/common/net/IpPort.java	93.33% <0.00%> (+3.33%)	0.00% <0.00%> (ø%)

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