[API Shield] Remove documentation for applying learned schemas

[djhworld]

Summary

• Removes references to the "Applied Learned Schema" functionality removed from the dashboard

• Removes references to the cf-risk-missing-schema label as this is no longer applied.

• The change adheres to the documentation style guide.

[cloudflare-docs-bot]

Review

✅ No issues found in commit 36b8e6b.

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[djhworld]

rebased PR onto main as got outdated PR check

[mattrighetti]

lgtm

[djhworld]

rebased + fixed merge conflicts