Section Translation documentation update

[austinhutchison]

Describe the enhancement you'd like
I was unfamiliar with localization markup within {% schema %} tags and it is used throughout the Dawn sections (e.g. "name": "t:sections.main-product.name") . I'm still unsure how the t: markup really works.

I'd like to see better documentation of the localization in the sections documentation here: https://shopify.dev/themes/architecture/sections/section-schema#locales and for the examples to reference how Dawn approaches localization.

Please let me know if this documentation is located elsewhere and I just wasn't able to find it. (google-fu doesn't play so nicely with colons 😔)

Describe alternatives you've considered
I would also consider updating the readme to include a statement regarding Dawns approach to localization. Many developers won't have the need or resources to build out locale files for new sections and it would be nice to recognize that Dawn is maybe not the best example or at least won't reflect lots of real world use cases in this regard.

Additional context/screenshots
n/a