FC-0068 docs: how-tos review by edunext 16

[Apgomeznext]

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

The files modified:

• ti_prepare_content.rst
• timed_exams.rst
• add_poll_question.rst
• create_zooming_image.rst
• edit_text_input_advanced.rst
• add_pages.rst This file was divided into:
• add_custom_page.rst
• enable_calculator.rst
• enable_notes.rst
• enable_teams.rst
• enable_textbook.rst
• enable_wiki.rst
• reorder_deleting_custom_pages.rst

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[sarina]

This link: http://files.edx.org/jqueryloupeAndLightbox.js does not work. Please file a bug with this page.

[sarina]

Please resolve conflicts as well.