Add broadcast scopes to OAuth 1.0a token exchange mapping

[mintlify]

Adds broadcast.read to the Read row and broadcast.write to the Read and write row in the permission mapping table on the OAuth 1.0a → OAuth 2.0 token exchange page.

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Requested by: mrosinsky@x.ai via Slack
Mintlify session: slack_1790168941.672869_C09MQDT6BM4

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Project	Status	Preview	Updated
x-corp	🟢 Ready	View Preview	Sep 23, 2026, 1:11 PM

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[mintlify]

Docs PR opened: #449

Added a Sep 23, 2026 changelog entry noting that OAuth 1.0a to OAuth 2.0 token exchange now grants broadcast scopes.