When sharing a page via mail, the mail body says something like:
Some User thought you might be interested in the document Test on localhost.
Here is their message:
I guess the plural "their" helps to get around the her/his distinction, but sounds odd as the mail is sendby a single user.
I think simply using "the" instead of "their" is ok.
If nobody objects or has a better proposal I will do the change next week.