Remove slash

Signed-off-by: harupy <17039389+harupy@users.noreply.github.com>

dev/ruff.py

@@ -19,7 +19,7 @@ def transform(stdout: str, is_maintainer: bool) -> str:
                 )
                 line = f"{line}. Run {command} to fix this error."
             else:
-                line = f"{line}. See https://docs.astral.sh/ruff/rules//{m.group(1)} for how to fix this error."
+                line = f"{line}. See https://docs.astral.sh/ruff/rules/{m.group(1)} for how to fix this error."
         transformed.append(line)
     return "\n".join(transformed)