Update X Activity API private events and subscription limits

[mintlify]

Updates x-api/activity/introduction.mdx:

• Adds chat.received, chat.sent, dm.received, dm.sent, dm.read, dm.indicate_typing, and post.mention.create to the Private events list.
• Updates Subscription limits: Self-serve 1,500 · Enterprise 75,000 · Partner 150,000.

Requested by Michael Rosinsky.

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Generated by Mintlify Agent.

Requested by: smedinarolong@x.com via Slack
Mintlify session: slack_1783374950.518749_C09MQDT6BM4

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[mintlify]

Docs PR opened: #247

Fixed a missing possessive apostrophe in the dm.read event description, changing "filtered users" to "filtered user's".

[mintlify]

Docs PR opened: #248

Applied style guide fixes to the X Activity API introduction for consistent second-person voice, sentence case, and clearer phrasing.

[mintlify]

Docs PR opened: #249

Shortened the X Activity API introduction description from 191 to 148 characters to fit SEO length guidelines.

[mintlify]

Docs PR opened: #252

Translated the X Activity API private events list and updated subscription limits into Spanish, Japanese, Korean, and Portuguese.

[mintlify]

Docs PR opened: #250

Added a July 6, 2026 changelog entry announcing new X Activity API private events and updated subscription tier limits.

[mintlify]

Docs PR opened: #251

Synced the Spanish X Activity API intro with new private events, the post.mention.create event, and updated subscription limits.