Fixed #22618 -- Improved import_string example.

Thanks ewjoachim for the sugggestion.
Removed some references to django.contrib.comments which has been removed.
Fixed typo in transactions.txt
Fixed #22533 -- Added label_suffix parameter to form fields.

Fields can now receive the `label_suffix` attribute, which will override
a form's `label_suffix`.

This enhances the possibility to customize form's `label_suffix`, allowing
to use such customizations while using shortcuts such as
`{{ form.as_p }}`.

Note that the field's own customization can be overridden at runtime by
using the `label_prefix` parameter to `BoundField.label_tag()`.

Refs #18134.
Fixed spelling mistake and added a word to the word list.