docs: clarify that Jobs:;get gets Job id — radicle-job

Signed-off-by: Lars Wirzenius liw@liw.fi

         Ok(self.all()?.count())
     }
     /// Get a [`Job`].
     /// Get a [`Job`], given the object identifier for it (see
     /// [`JobMut::id`]).
     pub fn get(&self, id: &ObjectId) -> Result<Option<Job>, store::Error> {
         self.raw.get(id)
     }