Fix formatting in docs

[peterzhu2118]

What was the end-user or developer problem that led to this PR?

rdoc uses + for typewriter font rather than backticks. This causes incorrect formatting in the generated docs.

What is your fix for the problem, implemented in this PR?

Use + instead of backticks.

Make sure the following tasks are checked

• Describe the problem / feature
• Write tests for features and bug fixes
• Write code to solve the problem
• Make sure you follow the current code style and write meaningful commit messages without tags

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[deivid-rodriguez]

Thanks, will try to remember this in the future, since I guess there's no easy way to automatically enforce this? Maybe a RuboCop cop, NoBackticksInDocumentationHeader or something could help.

[peterzhu2118]

Unfortunately I don't know of a way to detect this automatically (using either rubocop or rdoc).