Redesign - style the function arguments and return type section

[jenweber]

File to work in: app/components/class-field-description.hbs

Style the "name" and "returns" section. Do not worry about the code block.

Currently, it looks like this in the WIP branch:

How it looks in production:

[MehulKChaudhari]

Hey Jen, I would like to work on this issue.