Escape tag names in internal function descriptions

[kungfooman]

Fixes: #33

I just want to make sure that ts-to-jsdoc works on itself without loosing information in descriptions - would be :ok_hand: :sweat_smile:

Test for escape method: https://ts-ast-viewer.com/#code/PQKhCgAIUgXBTAzrSADAAgBwIYCdsC2qkO+BcAFgJaKQ2TZxKxQjDgBmArgHYDGsKgHseTZAApShAFyRkuKjwDmASkgBvAL7ggA

Result:

[futurGH]

Fair enough!