`add_shortest_paths()` docs do not describe vpaths / epaths

[szhorvat]

The all_shortest_paths() docs describe the vpath and epath components in the return value, but this function actually returns vpaths and epaths (not plural).

I'm not sure what the best way is to deal with cases like this, when several related functions share a doc page. @maelle ?

[github-actions]

This old thread has been automatically locked. If you think you have found something related to this, please open a new issue and link to this old issue if necessary.