docs: remove stray code fence causing incorrect formatting
Removes a stray code fence that causes the block to render incorrectly in
Closes
@@ -521,7 +521,6 @@ It's an error for multiple conditions to match unless one is an unambiguous
If you need a `select` branch to match when multiple conditions match, use the
[Skylib](https://github.com/bazelbuild/bazel-skylib) macro
[config_setting_group](https://github.com/bazelbuild/bazel-skylib/blob/master/docs/selects_doc.md#selectsconfig_setting_group):
-```
```python
config_setting(
