Adding documentation for variable names

Description

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    1. [DOC-XXXX](https://openedx.atlassian.net/browse/DOC-XXXX)

This documents what variable names are allowed in math input expressions. This is currently undocumented. The impetus for this is a recent change that expanded the possibilities for variable names in the platform (edx/edx-platform#17370).

This change will go live 3/6/18.

Apologies that I don't know what to put elsewhere in this PR description.

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      1. Reviewers

Possible roles follow. The PR submitter checks the boxes after each reviewer finishes and gives :+1:.

  • [ ] Subject matter expert:

  • [ ] Subject matter expert:

  • [ ] Doc team review (sanity check, copy edit, or dev edit?): @edx/doc

  • [ ] Product review:

  • [ ] Partner support:

  • [ ] PM review:

FYI: @nedbat @pdpinch

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      1. Testing

  • [ ] Ran ./run_tests.sh without warnings or errors

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      1. HTML Version (optional)

  • [ ] Build an RTD draft for your branch and add a link here

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      1. Sandbox (optional)

  • [ ] Point to or build a sandbox for the software change and add a link here

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      1. Post-review

  • [ ] Add a comment with the description of this change or link this PR to the next release notes task.

  • [ ] Squash commits

Status

Assignee

Grant Goodman

Reporter

Open Source Pull Request Bot

Labels

Contributor Name

Jolyon Bloomfield

Repo

edx/edx-documentation

PR Number

1,668

Customer

Course

None

OSCM Assignee

None

Github Latest Action

pull_request: closed

Github Latest Action by edX

Yes

Github PR Last Updated At

Mar 06, 2018, 9:00 PM

Github PR Last Updated By

grantgoodmanedX

Impacted Users (OSPR)

None

Impacted Environments (OSPR)

None

Feature Control (OSPR)

None

Priority

Unset
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