fix: escape at-sign handle with a backslash to prevent bibtex citations detection

Author: MatMatt

DOCS/products/Technical_Report_Mapping_Population_Density.qmd

@@ -485,7 +485,7 @@ As the science and knowledge service of the European Commission, the Joint Resea
 **EU Science Hub**
 ec.europa.eu/jrc
 
-"@EU_ScienceHub"
+"\@EU_ScienceHub"
 
 EU Science Hub - Joint Research Centre