Fix function comments based on best practices from Effective Go

[CodeLingoBot]

Every exported function in a program should have a doc comment. The first sentence should be a summary that starts with the name being declared. From effective go.

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[Daanikus]

Hi there! Dan from CodeLingo here. This PR is testing out a new service. I'd love to hear your feedback or answer your questions. We're keen to learn how we can best help dev teams without getting in your way.

Dan & the CodeLingo Team