docs: add map.get and map.merge_list; align map functions on null/coercion behavior

[imilinovic]

Release note

Documented the new map.get and map.merge_list functions in the map module, and updated map.merge, map.set_key, and map.from_values to reflect the aligned null handling, node/relationship coercion, and renamed merge arguments (map1/map2).

Related product PRs

memgraph/memgraph#4417

Checklist:

• Add appropriate milestone (current release cycle)
• Add bugfix or feature label, based on the product PR type you're documenting
• Make sure all relevant tech details are documented
  • Update reference pages (e.g. clauses, functions, flags, experimental, monitoring, Cypher differences)
  • Search for the feature you are working on (mentions) and make updates if needed
  • Provide a basic example of usage
  • In case your feature is an Enterprise one, list it under ME page and mark its page with Enterprise (example).
• Check all content with Grammarly
• Perform a self-review of my code
• The build passes locally
• My changes generate no new warnings or errors

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Project	Deployment	Actions	Updated (UTC)
documentation	Ready	Preview, Comment	Jul 27, 2026 12:35pm