docs: Update changing monetization setting

[patrikbraborec]

Note

Clarifies monetization change behavior: most changes apply immediately; major changes (e.g., model switch, price increases, new pay-per-event charges) require 14-day notice and are limited to once per month.

• Docs: Monetization policy updates
  • Clarify change behavior in sources/academy/platform/get_most_of_actors/monetizing_your_actor.md and sources/platform/actors/publishing/monetize/index.mdx:
    • Most changes take effect immediately.
    • Define “major changes” requiring 14-day notice (pricing model changes, price increases, adding pay-per-event charges).
    • Limit major changes to once per month; add dedicated important note block.
  • Minor adjustments:
    • Fix typo “wixard” → “wizard”.
    • Adjust heading level for "Changing monetization".

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