fix typo

Author: C-Loftus

src/main.py

@@ -31,7 +31,7 @@ def main():
     zip_path = base_dir / "Gazetteer_National_GPKG.zip"
 
     if not gnis_gpkg.exists():
-        logger.info("Downloading GNIS GeoPackage; this is large file and may take a while...")
+        logger.info("Downloading GNIS GeoPackage; this is a large file and may take a while...")
 
         url = (
             "https://prd-tnm.s3.amazonaws.com/"