wave: document per-org points budget

[efstajas]

Summary

Updates wave/maintainers/points-budgets to cover the new per-org points cap that's added alongside the existing per-repo cap (drips-network/wave#590, drips-network/app#1904).

• Intro and "How It Works" now describe both caps: the per-repo budget per approved repo, and the per-org budget shared across all of an org's approved repos in a Wave Program.
• Replaces the "base points" shorthand with "pre-multiplier points (base + complexity bonus)" — that's the value actually summed for budget enforcement.
• "Viewing Your Budget" now points at both the new Orgs section (per-org gauges, with a Wave Program selector) and the existing Repo Applications list (per-repo gauges).
• Enforcement and reset sections updated to mention both caps.

Test plan

• Render the page locally and confirm formatting / links are intact.
• Sanity-check the worked example: per-repo 500, per-org 2,000 — single Trivial = 100 pre-multiplier points.

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