Document nullability of map type

[ebyhr]

Release notes

(x) This is not user-visible or is docs only, and no release notes are required.

Summary by Sourcery

Documentation:

• Specify that map keys are required and map values can be null in the MAP type description

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR updates the documentation for the MAP type by clarifying that map keys are mandatory and map values may be null, ensuring users understand the nullability constraints.

Class diagram for updated MAP type documentation

classDiagram
class MAP {
  +Key : required
  +Value : nullable
}

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File-Level Changes

Change	Details	Files
Clarified MAP type nullability in documentation	Added note that map keys are required Added note that map values can be null	docs/src/main/sphinx/language/types.md

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[sourcery-ai]

Hey there - I've reviewed your changes and they look great!

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