Fix name in source/README.md

source/README.md

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 # Hotwash RAG Sources
 
-This directory contains primary source documents used for bootstrapping the RAG index for the **Black Swan** disaster simulator.
+This directory contains primary source documents used for bootstrapping the RAG index for the **Hotwash** disaster simulator.
 
 ## Contents
 - `hseep_2020.pdf` — FEMA’s Homeland Security Exercise and Evaluation Program (HSEEP) doctrine.