Update 23.md

Co-authored-by: mplorentz <mplorentz@users.noreply.github.com>
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@ -21,7 +21,7 @@ For the date of the last update the `.created_at` field should be used, for "tag
Other metadata fields can be added as tags to the event as necessary. Here we standardize 4 that may be useful, although they remain strictly optional:
- `"title"`, for the article title
- `"image"`, for an image to be shown along with the title
- `"image"`, for a URL pointing to an image to be shown along with the title
- `"summary"`, for the article summary
- `"published_at"`, for the timestamp in unix seconds (stringified) of the first time the article was published