C++ API remove mgp::memory usage

[Ignition]

Description

Change wording to change the focus around mgp::memory. It was softly deprecated before, but now we want to encourage modules to be updated.

Pull request type

Please check what kind of PR this is:

• Fix or improvement of an existing page
• New documentation page, release related

Related PRs and issues

PR this doc page is related to:
memgraph/memgraph#2424

Closes:
(paste the link to the issue it closes)

Checklist:

• Check all content with Grammarly
• Perform a self-review of my code
• Make corresponding changes to the rest of the documentation (consult with the DX team)
• The build passes locally
• My changes generate no new warnings or errors
• Add a corresponding label
• If release-related, add a product and version label
• If release-related, add release note on product PR

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Name	Status	Preview	Comments	Updated (UTC)
documentation	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 3, 2024 1:13am

[hal-eisen-MG]

Changed PR to target the memgraph-2-21 branch instead of main.