chore(warning): make message accurate

Co-authored-by: Gil Forsyth <gforsyth@users.noreply.github.com>

ibis/backends/bigquery/__init__.py

@@ -307,7 +307,7 @@ def table(
             util.warn_deprecated(
                 "database",
                 instead=(
-                    f"{self.name} cannot list tables only using `database` specifier. "
+                    f"The {self.name} backend cannot return a table expression using only a `database` specifier. "
                     "Include a `schema` argument."
                 ),
                 as_of="7.1",