Update metadata parquet column description

README.md

@@ -23,7 +23,8 @@ Note that if this space is duplicated, the sample image portion **will not work*
 **bioclip-2/metadata.parquet:** metadata file for fetching [TreeOfLife-200M](https://huggingface.co/datasets/imageomics/TreeOfLife-200M) sample images (up to 3 available per taxa) from an S3 bucket.
 - `uuid`: unique identifier for the image within the TreeOfLife-200M dataset.
 - `eol_page_id`: identifier of EOL page for the most specific taxa of the image (where available). Note that an image's association to a particular page ID may change with updates to the EOL (or image provider's) hierarchy. However, EOL taxon page IDs are stable. "https://eol.org/pages/" + `eol_page_id` links to the page.
-- `gbif_id`: identifier used by GBIF for the most specific taxa of the image (where available). "https://gbif.org/species/" + `taxonID` links to the page.
+- `gbif_id`: GBIF identifier for the occurrence from which the image is sourced.
+- `gbif_taxon_id`: identifier used by GBIF for the most specific taxa of the image (where available). "https://gbif.org/species/" + `gbif_taxon_id` links to the page.
 - `kingdom`: kingdom to which the subject of the image belongs (all `Animalia`).
 - `phylum`: phylum to which the subject of the image belongs.
 - `class`: class to which the subject of the image belongs.