The help for RH 2019 is not up to date.
When I open the topic for updating the dictionary for a project, the steps refer to the Tools menu, when they should point to the Review menu, Spelling options button.
Is this a bug I should report?
Please follow this link to report bugs including documenatation issues or request features. https://tracker.adobe.com
Post the link to your bug report / feature request in this thread and others can vote for it. The more people who do so, the higher it gets prioritised.