docs: document runtime network endpoints azd contacts (#4415)

[dipeshpandit12]

Add docs/reference/network-endpoints.md cataloguing the external hosts azd may contact at runtime (control plane, auth, telemetry, tool downloads, templates, extensions, self-update, CI/CD), plus a minimum allowlist for firewalled environments. Link it from the docs Reference index and add the new host-name terms to the misc cspell dictionary.

Fixes #4415

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[jongio]

Reviewed this as a docs-accuracy PR and checked the endpoint claims against the cited source constants. The per-cloud suffixes in cloud.go, the prod/dev telemetry endpoints in telemetry.go, the experimentation host in experimentation.go, the self-update hosts in update/manager.go, the hardcoded graph.microsoft.com in graphsdk.go, the bicep and pack download URLs, the template and extension registry URLs, the OIDC issuer in entraid.go, and the raw/api.github.com normalization in gh_source.go all match the code.

The cspell additions land in the docs/reference/**/*.md override block, so they cover the new file, and they keep the existing alphabetical ordering.

Nothing to change.