Document 2GiB and 4GiB headless memory options

[sjmiller609]

Summary

• Document the optional 2GiB and 4GiB allocations for non-GPU headless browsers while preserving the 1GiB default.
• Update only the headless, per-browser resources, and memory-inspection guidance. Leave SDK examples unchanged.

Validation

• Passed mint@4.2.930 validate and mint@4.2.930 broken-links.
• Ran the local docs preview; all three changed pages returned HTTP 200 and rendered 2GiB and 4GiB.
• Passed git diff --check.

Deployment order

Merge after the 2GiB / 4GiB headless API support and SDK updates are released.

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Note

Low Risk
Documentation-only updates to browser memory guidance; no runtime or API code changes in this PR.

Overview
Documents optional 2GiB and 4GiB memory for non-GPU headless browsers (default stays 1GiB), and aligns how memory is set on create a browser or pools across three pages.

Concurrency and limits now lists non-GPU headless/headful size options instead of only headful 16 GB via pools. Headless mode adds a short note on raising headless allocation and clarifies the default footprint. Process execution updates the free-based memory guidance so in-session readings match the new headless tiers and headful 16GiB option.

No SDK examples or API behavior changes—docs only, intended to ship after the API/SDK support lands.

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