Fix Trends by WOEID response docs: remove tweet_count

[mintlify]

Reported in Slack: GET /2/trends/by/woeid/{woeid} documents tweet_count on trend.fields and in the example response, but the API returns trend_name only — even when trend.fields=tweet_count is passed. Forum report: https://devcommunity.x.com/t/trends-by-woeid-not-returning-tweet-count-even-when-specified/257182

Changes:

• openapi.json: dropped tweet_count from the Trend schema and from the TrendFieldsParameter enum. Trend is only referenced by GetTrendsByWoeidResponse, so no other endpoints are affected. PersonalizedTrend (used by /2/users/personalized_trends) is untouched — that endpoint still returns tweet_count.
• x-api/trends/trends-by-woeid/introduction.mdx: removed tweet_count from the example response.

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Requested by: tcaldwell@x.ai via Slack
Mintlify session: slack_1786669280.650509_C09MQDT6BM4

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