Add mention of new features to tutorials

[goobertron]

This is a meta-issue, on which I'll keep a list of features added to the Diaspora app that need to be added to the tutorials.

• birthday notifications

Please post any missing new features you notice below, and I'll keep the list updated.
Thanks.

[Flaburgan]

Thanks for doing that job! I didn't check but is mention in comment already in there?

[goobertron]

Hi, thanks for thinking of that. Yes, I've already added comment mentions to part 5, about the publisher.