docs: replace outdated ALL_TRAFFIC syntax with selector callbacks

[mishushakov]

Updates docs/sandbox/internet-access.mdx to replace the outdated ALL_TRAFFIC constant in all code examples with the recommended selector-callback syntax (denyOut: ({ allTraffic }) => [allTraffic] in JS, "deny_out": lambda ctx: [ctx.all_traffic] in Python), per e2b-dev/E2B#1286, and drops ALL_TRAFFIC from the relevant imports. The dedicated ALL_TRAFFIC helper section is removed since the Selector callbacks section already documents the deny-all pattern. Also adds a note that updating per-host network.rules (transforms) on a running sandbox currently has no effect, since transforms only apply at creation time.

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PR Summary

Low Risk
Documentation-only changes to examples and wording; no runtime or API behavior changes in this diff.

Overview
Updates docs/sandbox/internet-access.mdx so sandbox network docs match the current SDK style from E2B#1286.

Examples that used ALL_TRAFFIC now use selector callbacks for deny-all (denyOut: ({ allTraffic }) => [allTraffic] / "deny_out": lambda ctx: [ctx.all_traffic]), with ALL_TRAFFIC removed from imports. The standalone ALL_TRAFFIC helper section and the duplicate selector callbacks section are dropped in favor of a short Note that callbacks are recommended while ALL_TRAFFIC stays for backward compatibility.

Prose is tightened across JS/Python: camelCase / snake_case option names, clearer allow/deny wording, and per-host rules examples now include explicit denyOut deny-all lines. updateNetwork notes clarify that network.rules (transforms) are create-only, alongside allowPublicTraffic and maskRequestHost.

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