Document both locations of private mentoring link (#307)

Author: katrinleinweber

using/feedback/private.md

@@ -2,7 +2,8 @@
 
 By default, when you submit your solution for mentoring, it is sent to our team of volunteer mentors, one of whom will choose to give feedback on it.
 However, sometimes you might prefer to receive feedback from someone you know, rather than one of our mentors.
-If you have a friend, colleague, etc that you'd like to receive feedback from, you can send them the link that appears on the Mentoring page on one of your exercises.
+If you have a friend, colleague, etc that you'd like to receive feedback from, you can send them the link that appears
+both in the "Request mentoring" dropdown menu on one of your exercises, and on its Mentoring page.
 
 If you are using Exercism as part of a Bootcamp or course, this feature allows you to send your work to your teachers for their review, rather than overloading our team of mentors.