Document N-dimensional arrays

[mtopolnik]

No description provided.

[Copilot]

Pull Request Overview

This PR enhances the documentation by introducing detailed information on QuestDB's support for N-dimensional arrays and updates related type definitions and function signatures. Key changes include:

• Adding a new section describing the N-dimensional array type with visual examples and detailed explanation of its layout.
• Updating type definitions in the SQL reference (e.g., for date, interval, and array) with clearer annotations.
• Revising the function documentation for l2price to reflect new parameter names and variants for array-based and scalar inputs.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
documentation/reference/sql/datatypes.md	Clarified type definitions and added documentation for the N-dimensional array type.
documentation/reference/operators/numeric.md	Added a note indicating that numeric operators support N-dimensional array operations.
documentation/reference/function/finance.md	Updated the l2price function signature and examples to use new parameter names and variants.

Comments suppressed due to low confidence (2)

documentation/reference/sql/datatypes.md:29

• [nitpick] Consider clarifying the header size calculation by explicitly stating that 'nDims' represents the number of dimensions and confirming the units (bytes) used in the formula.

| `array`           | See description | Yes      | Header: 20 + 4 * `nDims` bytes. Payload: dense array of values. Example: `DOUBLE[3][4]`: header 28 bytes, payload 3*4*8 = 96 bytes.

documentation/reference/function/finance.md:13

• [nitpick] Ensure that the naming of parameters ('target_size', 'size_array', and 'price_array') is consistent with the scalar variant and clearly conveys their purpose.

`l2price(target_size, size_array, price_array)`

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