Document bulk create bookmark support (tweet_ids)

[mintlify]

Updates the OpenAPI spec for POST /2/users/{id}/bookmarks to reflect the shipped bulk bookmark contract:

• Request body is now one of two shapes: tweet_id for a single Post (response unchanged) or tweet_ids (1–25 IDs) for bulk. The two fields are mutually exclusive.
• Optional folder_id applies to every Post in the request.
• Bulk requests return 200 with data as an array of { tweet_id, bookmarked } results; Posts that could not be bookmarked are reported in errors per ID without failing the whole request.
• Added an endpoint description covering the single vs. bulk behavior.

This drives the reference page at /x-api/users/create-bookmark.

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Requested by: pvann@x.ai via Slack
Mintlify session: slack_1788296773.398629_C09MQDT6BM4

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