[GitHub] [spark] yaooqinn opened a new pull request #26922: [MINOR][SQL][DOC] Fix some ambiguous descriptions and format issue in Dataset API Doc

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yaooqinn opened a new pull request #26922: [MINOR][SQL][DOC] Fix some ambiguous descriptions and format issue in Dataset API Doc
URL: https://github.com/apache/spark/pull/26922
 
 
   ### What changes were proposed in this pull request?
   
   1. When summarizing the string values, there are some implicit coversion which we need to clairfy
   2. there should be one more space for `unidoc` to generate listed values.
   
   
   ### Why are the changes needed?
   
   improve doc
   
   ### Does this PR introduce any user-facing change?
   <!--
   If yes, please clarify the previous behavior and the change this PR proposes - provide the console output, description and/or an example to show the behavior difference if possible.
   If no, write 'No'.
   -->
   yes, API doc changing 
   
   ### How was this patch tested?
   <!--
   If tests were added, say they were added here. Please make sure to add some test cases that check the changes thoroughly including negative and positive cases if possible.
   If it was tested in a way different from regular unit tests, please clarify how you tested step by step, ideally copy and paste-able, so that other reviewers can test and check, and descendants can verify in the future.
   If tests were not added, please describe why they were not added and/or why it was difficult to add.
   -->
   no

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