optimize: optimize some javadocs

[slievrly]

Ⅰ. Describe what this PR did

optimize: optimize some javadocs

Ⅱ. Does this pull request fix one issue?

Ⅲ. Why don't you add test cases (unit test/integration test)?

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[codecov-commenter]

Codecov Report

Merging #3664 (8884670) into develop (5fac979) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             develop    #3664   +/-   ##
==========================================
  Coverage      51.91%   51.91%           
  Complexity      3500     3500           
==========================================
  Files            639      639           
  Lines          21181    21181           
  Branches        2634     2634           
==========================================
  Hits           10996    10996           
  Misses          9091     9091           
  Partials        1094     1094           

Impacted Files	Coverage Δ	Complexity Δ
...c/main/java/io/seata/common/util/CompressUtil.java	96.00% <ø> (ø)	7.00 <0.00> (ø)
...seata/core/exception/AbstractExceptionHandler.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
.../src/main/java/io/seata/core/protocol/Version.java	7.40% <ø> (ø)	2.00 <0.00> (ø)
.../main/java/io/seata/rm/datasource/ColumnUtils.java	86.59% <ø> (ø)	27.00 <0.00> (ø)
...n/java/io/seata/rm/datasource/ConnectionProxy.java	24.64% <ø> (ø)	13.00 <0.00> (ø)
.../java/io/seata/rm/datasource/DataCompareUtils.java	74.11% <ø> (ø)	27.00 <0.00> (ø)
.../java/io/seata/rm/datasource/SqlGenerateUtils.java	95.23% <ø> (ø)	18.00 <0.00> (ø)
...o/seata/rm/datasource/exec/BaseInsertExecutor.java	71.89% <ø> (ø)	83.00 <0.00> (ø)
.../rm/datasource/exec/BaseTransactionalExecutor.java	58.77% <ø> (ø)	27.00 <0.00> (ø)
.../rm/datasource/exec/mysql/MySQLInsertExecutor.java	69.41% <ø> (ø)	16.00 <0.00> (ø)
... and 17 more

[l81893521]

LGTM

[funky-eyes]

LGTM