Document jsonb_pretty, jsonb_object, and regexp_split_to_array

[neverchanje]

Info

• Description

  • [ What's changed? Which parts of the docs are affected? ]

• Notes

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• Related code PR

  feat(expr): add jsonb_pretty function risingwave#13050
  feat(expr): add jsonb_object function risingwave#13036
  feat(expr): add regexp_split_to_array risingwave#12844

• Related doc issue

  Resolves Document: feat(expr): add jsonb_pretty function #1428
  Resolves Document: feat(expr): add jsonb_object function #1431
  Resolves Document: feat(expr): add regexp_split_to_array #1383

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Before merging

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