update javadocs for isJson UDF

[tibrewalpratik17]

• Updating javadocs based on the discussion in Add isJson UDF #12603

cc @Jackie-Jiang

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 61.83%. Comparing base (59551e4) to head (e9389cc).
Report is 118 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #12636      +/-   ##
============================================
+ Coverage     61.75%   61.83%   +0.08%     
+ Complexity      207      198       -9     
============================================
  Files          2436     2453      +17     
  Lines        133233   133831     +598     
  Branches      20636    20754     +118     
============================================
+ Hits          82274    82761     +487     
- Misses        44911    44956      +45     
- Partials       6048     6114      +66     

Flag	Coverage Δ
custom-integration1	<0.01% <ø> (-0.01%)	⬇️
integration	<0.01% <ø> (-0.01%)	⬇️
integration1	<0.01% <ø> (-0.01%)	⬇️
integration2	0.00% <ø> (ø)
java-11	61.75% <ø> (+0.04%)	⬆️
java-21	61.72% <ø> (+0.09%)	⬆️
skip-bytebuffers-false	61.77% <ø> (+0.02%)	⬆️
skip-bytebuffers-true	61.69% <ø> (+33.96%)	⬆️
temurin	61.83% <ø> (+0.08%)	⬆️
unittests	61.83% <ø> (+0.08%)	⬆️
unittests1	46.95% <ø> (+0.06%)	⬆️
unittests2	27.71% <ø> (-0.02%)	⬇️

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