Fix flex udf nav - flex sub-categories

[shahar-biron]

Alphabetical ordering of sub-categories under Flex main page.

Summary by CodeRabbit

• Documentation
  • Reorganized user-defined function documentation by consolidating related functions into dedicated category pages including Bitwise, Collection, Date, JSON, Map, Similarity, and Text functions for improved navigation and discoverability.

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[coderabbitai]

📝 Walkthrough

Walkthrough

This pull request reorganizes the FLEX UDF documentation hierarchy by introducing category-level index pages and updating front matter metadata across 47 Markdown files. The changes reclassify existing function documentation under new parent categories (Bitwise Functions, Collection Functions, Date Functions, JSON Functions, Map Functions, Similarity Functions, and Text Functions) while maintaining all functional content unchanged.

Changes

Cohort / File(s)	Summary
Bitwise Functions udfs/flex/bitwise/index.md (new), udfs/flex/bitwise/and.md, udfs/flex/bitwise/not.md, udfs/flex/bitwise/or.md, udfs/flex/bitwise/shiftLeft.md, udfs/flex/bitwise/shiftRight.md, udfs/flex/bitwise/xor.md	Created new category index page; updated front matter in 6 function pages to set parent: Bitwise Functions and grand_parent: FLEX Function Reference. No functional content changes.
Collection Functions udfs/flex/collections/index.md (new), udfs/flex/collections/frequencies.md, udfs/flex/collections/intersection.md, udfs/flex/collections/shuffle.md, udfs/flex/collections/union.md, udfs/flex/collections/zip.md	Created new category index page; updated front matter in 5 function pages to set parent: Collection Functions and grand_parent: FLEX Function Reference. No functional content changes.
Date Functions udfs/flex/date/index.md (new), udfs/flex/date/format.md, udfs/flex/date/parse.md, udfs/flex/date/toTimeZone.md, udfs/flex/date/truncate.md	Created new category index page; updated front matter in 4 function pages to set parent: Date Functions and grand_parent: FLEX Function Reference. No functional content changes.
JSON Functions udfs/flex/json/index.md (new), udfs/flex/json/fromJsonList.md, udfs/flex/json/fromJsonMap.md, udfs/flex/json/toJson.md	Created new category index page; updated front matter in 3 function pages to set parent: JSON Functions and grand_parent: FLEX Function Reference. No functional content changes.
Map Functions udfs/flex/map/index.md (new), udfs/flex/map/fromPairs.md, udfs/flex/map/merge.md, udfs/flex/map/removeKey.md, udfs/flex/map/removeKeys.md, udfs/flex/map/submap.md	Created new category index page; updated front matter in 5 function pages to set parent: Map Functions and grand_parent: FLEX Function Reference. No functional content changes.
Similarity Functions udfs/flex/similarity/index.md (new), udfs/flex/similarity/jaccard.md	Created new category index page; updated front matter in 1 function page to set parent: Similarity Functions and grand_parent: FLEX Function Reference. No functional content changes.
Text Functions udfs/flex/text/index.md (new), udfs/flex/text/camelCase.md, udfs/flex/text/capitalize.md, udfs/flex/text/decapitalize.md, udfs/flex/text/format.md, udfs/flex/text/indexOf.md, udfs/flex/text/indexesOf.md, udfs/flex/text/jaroWinkler.md, udfs/flex/text/join.md, udfs/flex/text/levenshtein.md, udfs/flex/text/lpad.md, udfs/flex/text/regexGroups.md, udfs/flex/text/repeat.md, udfs/flex/text/replace.md, udfs/flex/text/rpad.md, udfs/flex/text/snakeCase.md, udfs/flex/text/swapCase.md, udfs/flex/text/upperCamelCase.md	Created new category index page; updated front matter in 17 function pages to set parent: Text Functions and grand_parent: FLEX Function Reference. No functional content changes.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~15 minutes

Poem

🐰 Hop along through cleaner halls,
Where docs now live in organized stalls,
Bitwise, Date, and Text so bright,
Each function nested just right!
The hierarchy blooms, a tidy delight. ✨

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Title check	✅ Passed	The PR title clearly describes the main change: reorganizing FLEX UDF documentation navigation by introducing sub-category pages (Bitwise, Collection, Date, JSON, Map, Similarity, and Text Functions), moving individual function pages under their respective categories.

✨ Finishing touches

• 📝 Generate docstrings

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