Alphabetize django.utils sections in docs

Contents sections before:

```
...
django.utils.text
django.utils.translation
django.utils.timezone
django.utils.tzinfo
...
```

Contents sections after:

```
...
django.utils.text
django.utils.timezone
django.utils.translation
django.utils.tzinfo
...
```
be careful not to introduce lines with whitespace in them. I removed it before merging in e7827b94940860d6af737b5ea0105b6460cba53c.