DOC: black enhancingperf.rst and 10min.rst code style
ref #36777
@BeanNan If you add this to the flake8-rst ignore list in setup.cfg that should fix the lint error:
```
E203,  # space before : (needed for how black formats slicing)
``` 



> @BeanNan If you add this to the flake8-rst ignore list in setup.cfg that should fix the lint error:
> 
> ```
> E203,  # space before : (needed for how black formats slicing)
> ```

I added it, but CI still seems to have some problems Thanks @BeanNan 