HyukjinKwon opened a new pull request, #36084:
URL: https://github.com/apache/spark/pull/36084

   ### What changes were proposed in this pull request?
   
   This PR proposes two minor changes:
   - Fixes the example at `Dataset.observe(String, ...)`
   - Adds `varargs` to be consistent with another overloaded version: 
`Dataset.observe(Observation, ..)`
   
   ### Why are the changes needed?
   
   To provide a correct example, support Java APIs properly with `varargs` and 
API consistency.
   
   ### Does this PR introduce _any_ user-facing change?
   
   Yes, the example is fixed in the documentation. Additionally Java users 
should be able to use `Dataset.observe(String, ..)` per `@varargs`.
   
   ### How was this patch tested?
   
   Manually tested. CI should verify the changes too.


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