Docs: Fixes examples for allowTemplateLiterals

[zoeingram]

What is the purpose of this pull request? (put an "X" next to item)

[ X] Documentation update
[ ] Bug fix ([template](https://github.com/eslint/eslint/blob/master/templates/bug-report.md))
[ ] New rule ([template](https://github.com/eslint/eslint/blob/master/templates/rule-proposal.md))
[ ] Changes an existing rule ([template](https://github.com/eslint/eslint/blob/master/templates/rule-change-proposal.md))
[ ] Add autofixing to a rule
[ ] Add a CLI option
[ ] Add something to the core
[ ] Other, please explain:

If the item you've check above has a template, please paste the template questions here and answer them.

Please check each item to ensure your pull request is ready:

• [X ] I've read the pull request guide
• [ X] I've included tests for my change
• [X ] I've updated documentation for my change (if appropriate)

What changes did you make? (Give an overview)
In the allowTemplateLiterals section of the quotes rules, the code for "double" demonstrates examples for 'single' documentation, and vice versa. I changed the code in the double and single section to correspond to the appropriate example.

Is there anything you'd like reviewers to focus on?

Corrects 'single' example to correlate to single, and "double" example to correlate to double

[mention-bot]

@zoeingram, thanks for your PR! By analyzing the annotation information on this pull request, we identified @scriptdaemon, @IanVS and @mduvall to be potential reviewers

[eslintbot]

LGTM

[kaicataldo]

LGTM. Thanks for contributing to ESLint!