Hi there,

Since 2.7, options introduced bysymfony/symfony#14050 are inherited byEntityType and works well exceptchoice_value which failed at validation step but will be fix bysymfony/symfony#17694. However not all of them are mentioned in the doc.

There were recent PR forchoice_translation_domain andtranslation_domain, as of 2.7EntityType is still missing some doc forchoice_value,choice_attr, andchoice_name.

I'm sending a PR for this.