docs: Update student profile report columns

[bmtcril]

Per #647 I'm attempting to clarify the columns listed in this doc a bit more and correct a couple of points that I believe are currently wrong.

[bmtcril]

@jswope00 I'm pinging you on this one if you have time, since you may have context I don't about some of the details. No worries if you don't have time, though!

[jswope00]

This exceeds my understanding of this report. E.g. I wasn't aware of how the verification_status column was enabled. I had actually just deleted that column during some cleanup I was doing today that involved this doc. But I'll defer to your more accurate explanation.

[sarina]

@bmtcril - you wrote in the other ticket:

I think that the text:

" The descriptions of columns in the following table apply to edx.org. Required or optional fields shown to learners during registration and available for editing in Account Settings might vary for Open edX sites."

Only shows up on the edx.org documentation, which is the opposite of what I'd expect based on the tag, but you can see it here:

https://edx.readthedocs.io/projects/open-edx-building-and-running-a-course/en/latest/student_progress/course_student.html#columns-in-the-student-profile-report

but not here:

https://docs.openedx.org/en/latest/educators/references/data/student_profile_report.html

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Should we just remove the "Open edX" directive and have all the text there?

[sarina]

@bmtcril bumping this in your inbox - I have a question here, otherwise this is good to merge

[bmtcril]

@sarina I've clarified the messaging around configuration of columns and removed the only block. I'll merge if it passes tests and looks correct on rtd.