feat(astro:i18n): add docs for some missing public utilities

[ArmandPhilippot]

Description (required)

The i18nNoLocaleFoundInPath error suggests to use the pathHasLocale helper... but I couldn't find it in the docs. Actually we're missing a few utilities in the astro:i18n reference.

Adds documentation for:

• normalizeTheLocale() (since astro:i18n release? Maybe this was made public later but I couldn't find a PR suggesting this)
• pathHasLocale() (added in 4.6.0, feat(i18n): manual routing astro#10193)
• toCodes() (added in 4.0.0, feat(i18n): refined locales astro#9200)
• toPaths() (added in 4.0.0, feat(i18n): refined locales astro#9200)

I'm not quite sure about the use cases, so I added examples based on the getPathByLocale() one.

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[sarah11918]

Thank you so much, @ArmandPhilippot ! I'm going to ask @ematipico to review this, make sure everything here should be in docs etc. before I look too closely! 🙌

[sarah11918]

Noting that Ema is on a few weeks of holidays right now, so we'll get around to this one, eventually! 😄