Update from code changes: RSS publication date override

[mintlify]

Documents the new date property on the Update component's rss prop, which sets the RSS feed entry's publication date.
RSS dates come from git history, so changelog entries that were migrated in bulk or edited later showed the commit date instead of the release date. rss.date overrides that, and Mintlify ignores invalid dates and falls back to the git-derived date.
The Mintlify agent skill's component reference also mentions the new property.
Based on a merged product change, "allow overriding Update pubDate via rss.date", which added the override to RSS feed generation.

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Note

Low Risk
Documentation-only changes with no runtime or API behavior in this PR.

Overview
Documents rss.date on the Update component so authors can set the RSS entry publication date instead of relying on Git commit history.

The components/update.mdx props section adds a date field under rss (format like "2026-06-23"), explaining that migrated or later-edited changelog entries otherwise show the commit date, that date overrides that behavior, and that invalid values fall back to the Git-derived date. The Mintlify agent skill components.md reference is updated to list date alongside title and description on rss.

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