[PR] Improve documentation for `nullif` kernel [arrow-rs]

["alamb (via GitHub)" <gi...@apache.org>]

alamb opened a new pull request, #6658:
URL: https://github.com/apache/arrow-rs/pull/6658

   # Which issue does this PR close?
   
   Related to https://github.com/apache/arrow-rs/issues/6528
   
   # Rationale for this change
    
   @tustvold  pointed out the `nullif` kernel which is similar, but not the same, as what is asked for in https://github.com/apache/arrow-rs/issues/6528
   
   However the existing documentation for nullif was sparse and hard (for me) to discover
   
   # What changes are included in this PR?
   
   Improve the documentation and add an example
   
   # Are there any user-facing changes?
   Documentation only, no code changes
   
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Re: [PR] Improve documentation for `nullif` kernel [arrow-rs]

["tustvold (via GitHub)" <gi...@apache.org>]

tustvold merged PR #6658:
URL: https://github.com/apache/arrow-rs/pull/6658


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