docs: Complete nLinq reference documentation

[nmaguiar]

I've filled in missing sections in REFERENCE.md for nLinq functionality, including:

• Methods for restricting by value matching (contains, empty, match and variants)
• Methods for restricting by value type (type, is and variants)
• Methods for changing the current result set (each, intersect, attach, sort, etc.)
• Additional SELECT methods (groupBy, fnBy, minBy, maxBy, etc.)
• Query structure and logical modifiers (useCase, begin, and, or, etc.)

I also reviewed and corrected existing documentation for accuracy and clarity.

[Copilot]

Pull Request Overview

This pull request updates the nLinq reference documentation with additional method details and examples while adding two new scripts to extract JavaScript method signatures from the source file.

• Completed missing sections and improved clarity in REFERENCE.md for nLinq functionalities.
• Added extract_signatures.py to extract method names with a simple regex.
• Added extract_method_names.py to extract method names with an alternative regex approach.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
extract_signatures.py	New script for extracting method signatures from nlinq.js using regex patterns.
extract_method_names.py	New script offering an alternative regex approach for extracting method names.
REFERENCE.md	Updated and expanded documentation for various nLinq methods with examples and tables.

Comments suppressed due to low confidence (1)

REFERENCE.md:101

• The heading 'Restriciting prefixes and suffixes' appears to contain a spelling error. Please change it to 'Restricting prefixes and suffixes'.

### Restriciting prefixes and suffixes

[Copilot]

[nitpick] The regex pattern used to isolate the code block may not correctly handle nested braces in JavaScript objects. Consider using a more robust pattern or parser if the js_file structure becomes more complex.