typo fix

Author: leijerry888

docs/paper.bib

@@ -52,5 +52,5 @@ @misc{osm
 @misc {bto_blueprint,
     title={Decarbonizing the U.S. Economy by 2050: A National Blueprint for the Buildings Sector},
     author={{U.S. Department of Energy}},
-    howpublished={\url{https://www.energy.gov/eere/articles/decarbonizing-us-economy-2050}}
+    howpublished={\url{https://www.energy.gov/eere/articles/decarbonizing-us-economy-2050}},
     note={Accessed:2024-07-30}}