fix E266 in modular

<div id="comment:0"></div>

about

```
E266 too many leading '#' for block comment
```

Component: **refactoring**

Author: **Frédéric Chapoton**

Branch/Commit: **[`eb44bfa`](https://github.com/sagemath/sagetrac-mirror/commit/eb44bfa1fd58e1be3049cfc332d5b32a31294966)**

Reviewer: **Matthias Koeppe**

_Issue created by migration from https://trac.sagemath.org/ticket/34919_

