[PR] fix: document and fix macro hygiene for `config_field!` [datafusion]

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

crepererum opened a new pull request, #16473:
URL: https://github.com/apache/datafusion/pull/16473

   ## Which issue does this PR close?
   \-
   
   ## Rationale for this change
   The macro -- while being public and actually helpful -- is currently broken & undocumented.
   
   ## What changes are included in this PR?
   - docs
   - hygiene fixes
   
   ## Are these changes tested?
   - macro hygiene test
   
   ## Are there any user-facing changes?
   For devs: the macro now works.


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Re: [PR] fix: document and fix macro hygiene for `config_field!` [datafusion]

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

crepererum merged PR #16473:
URL: https://github.com/apache/datafusion/pull/16473


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