DOC: sphinx doc list item text has strange bold effect
### 

- [X] I have checked that the issue still exists on the latest versions of the docs on `master` [here](https://pandas.pydata.org/docs/dev/)


### Location of the documentation

- https://pandas.pydata.org/docs/dev/reference/api/pandas.DataFrame.replace.html
- https://pandas.pydata.org/docs/dev/reference/api/pandas.Series.replace.html
- and more 

### Documentation problem

As title.

![image](https://user-images.githubusercontent.com/25895405/136639776-5085c41f-d591-498b-a083-d1e19979914e.png)


### Suggested fix for documentation

In using sphinx experience, the following could fix that.
Note that `numeric` and `replaced` have the same indent level.

```diff
            - numeric: numeric values equal to `to_replace` will be
-                replaced with `value`
+              replaced with `value`
```

```
- numeric: numeric values equal to `to_replace` will be
  replaced with `value`  
```

My local test result.

![image](https://user-images.githubusercontent.com/25895405/136640134-543e756d-ea5b-4a03-bb12-e549e761f423.png)
