Fix incomplete JavaDoc

[Hen1ng]

• If this pull request closes/resolves/fixes an existing issue, replace the issue number. Closes #.
• Update the CHANGES log.

[codecov]

Codecov Report

Merging #5733 into master will decrease coverage by 0.03%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #5733      +/-   ##
============================================
- Coverage     51.62%   51.58%   -0.04%     
+ Complexity     3452     3449       -3     
============================================
  Files          1637      922     -715     
  Lines         34937    22815   -12122     
  Branches       3806     2196    -1610     
============================================
- Hits          18036    11770    -6266     
+ Misses        16016    10098    -5918     
- Partials        885      947      +62     

Impacted Files	Coverage Δ	Complexity Δ
...ent/core/plugin/jdk9module/JDK9ModuleExporter.java	73.91% <ø> (+3.07%)	4.00 <0.00> (ø)
...che/skywalking/apm/agent/core/meter/MeterType.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (ø%)
...e/skywalking/apm/agent/core/meter/CounterMode.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (ø%)
...org/apache/skywalking/apm/toolkit/meter/Gauge.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (ø%)
...ng/apm/agent/core/context/trace/LogDataEntity.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (ø%)
...p/server/core/analysis/metrics/MinLongMetrics.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (ø%)
...er/exporter/provider/grpc/GRPCExporterSetting.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (ø%)
...ent/core/plugin/bytebuddy/ReturnTypeNameMatch.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (ø%)
...core/plugin/bytebuddy/AnnotationTypeNameMatch.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (ø%)
...king/oap/server/configuration/api/ConfigTable.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (ø%)
... and 1127 more

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[kezhenxu94]

Good catch, thanks