fix: openapi schema should have example not examples under schema

prez/models/query_params.py

@@ -40,7 +40,7 @@ def __init__(
             description="Number of items per page, must be greater than 0",
         ),
         q: Optional[str] = Query(
-            None, description="Search query", examples=["building"]
+            None, description="Search query", example="building"
         ),
         filter: Optional[str] = Query(
             None,