Fix UDFs navigation submenu not rendering

[Copilot]

The UDFs navigation item wasn't displaying an expandable chevron despite having child pages (FLEX Function Reference and subcategories). Jekyll's just-the-docs theme requires exact title matches for parent-child relationships.

Changes

• Updated parent reference in udfs/flex/index.md: "UDFs - User Defined Functions" → "UDFs"
• Updated grand_parent references in 7 category index pages (bitwise, collections, date, json, map, similarity, text) to match parent title

The hierarchy now properly links:

UDFs
  └─ FLEX Function Reference
      ├─ Bitwise Functions
      ├─ Collection Functions
      ├─ Date Functions
      └─ ...

Original prompt

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This section details on the original issue you should resolve

<issue_title>UDF doesn't show the sub menu with the flex</issue_title>
<issue_description>

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Comments on the Issue (you are @copilot in this section)

• Fixes UDF doesn't show the sub menu with the flex #310

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[Copilot]

Pull request overview

This PR fixes a navigation hierarchy issue where the UDFs menu item was not displaying its submenu with an expandable chevron. The problem was caused by inconsistent parent/grand_parent references in the documentation frontmatter - the pages referenced "UDFs - User Defined Functions" but the actual parent page title is simply "UDFs".

Key Changes:

• Updated parent reference in /udfs/flex/index.md from "UDFs - User Defined Functions" to "UDFs"
• Updated grand_parent references across all 7 FLEX category pages to match the correct parent title

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
udfs/flex/index.md	Fixed parent reference to match actual UDFs page title
udfs/flex/bitwise/index.md	Updated grand_parent reference for navigation hierarchy consistency
udfs/flex/collections/index.md	Updated grand_parent reference for navigation hierarchy consistency
udfs/flex/date/index.md	Updated grand_parent reference for navigation hierarchy consistency
udfs/flex/json/index.md	Updated grand_parent reference for navigation hierarchy consistency
udfs/flex/map/index.md	Updated grand_parent reference for navigation hierarchy consistency
udfs/flex/similarity/index.md	Updated grand_parent reference for navigation hierarchy consistency
udfs/flex/text/index.md	Updated grand_parent reference for navigation hierarchy consistency

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