docs: add liking_user_id to like.create sample payload

[mintlify]

Updates the like.create sample payload in the X Activity API event payloads reference:

• Adds liking_user_id to the payload fields table and JSON sample.
• Adds a second user entry (the liking user) in includes.users.

Requested by @michael-rosinsky in Slack.

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Generated by Mintlify Agent.

Requested by: mrosinsky@x.ai via Slack
Mintlify session: slack_1789664553.284739_C09MQDT6BM4

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[mintlify]

Docs PR opened: #424

Added a Sep 17 weekly changelog entry covering the new Livestream API, Ads MCP expansion, chat moderators, and payload fixes.