Update SoftForkStrategy.mdx

[drifter089]

• remove controlled document banned

Closes # (if applicable).

Changes Proposed in This Pull Request

Checklist

• I tested my contribution locally, and it seems to work fine.
• Code and workflow changes are sufficiently documented.
• If new pages are added, maintainers are assigned for that document.
• If the document falls under a controlled category, a controlled document banner is present.

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