Update readme

README.md

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 The source code for the benchmark and dataset extraction is available on GitHub: [worldbank/ai4data](https://github.com/worldbank/ai4data/tree/main/experimental/data-snapshot).
 
 ## Dataset summary
-The `data-snapshot` dataset is an annotated corpus designed for the evaluation and development of models for extracting *data snapshots* from PDF documents. A **data snapshot** is defined as a figure or table that contains quantitative data derived from statistics, indicators, or structured data sources.
+The `data-snapshot` dataset is an annotated corpus designed for the evaluation and development of models for extracting *data snapshots* from PDF documents. A **data snapshot** is defined as a figure or table containing structured or semi-structured information intended for analytical interpretation or operational reuse.
 
 The benchmark spans humanitarian reports, World Bank policy research working papers, and project appraisal documents, and includes annotations for figures and tables that contain reusable analytical information.