FC-0068 docs: reference and how-tos reviewed by edunext 21

[Apgomeznext]

This PR modifies how-to and reference documents migrated from the legacy repositories to the educators' documentation.

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[sarina]

I would add in the Note from the Reference to this page as well, because it's important.

.. note:: Creating a poll requires you to export your course, edit some of
 your course's XML files in a text editor, and then re-import your course. We
 recommend that you create a backup copy of your course before you create the
 poll. We also recommend that you only edit the files that will contain polls
 in the text editor if you are very familiar with editing XML.

[sarina]

I don't see why this is here. This either

(a) refers to the Qualtrics survey tool, in which case I don't see why you'd put these instructions next to the instructor dashboard instructions;

(b) refers to something edx.org-specific

I don't know which. @jswope00 - any ideas? This section seems incongruous with the above section on downloading data from the instructor dashboard.

[sarina]

Downloading data from the instructor dashboard should be under Course Data, no? https://docs.openedx.org/en/latest/educators/navigation/data_analytics.html @jswope00

[sarina]

I don't understand why this note was added, without a link to the alternative option. What should I do with this note?