Add redirect for legacy addresses page

[PerceiveWorld]

Summary

• add a Netlify redirect for the legacy Craft 5 addresses URL
• send /docs/5.x/addresses.html to the existing address field docs page

Fixes #772.

Checks

• curl -I -L https://craftcms.com/docs/5.x/addresses.html currently returns 404
• curl -I -L https://craftcms.com/docs/5.x/reference/field-types/addresses.html returns 200
• verified branch diff only changes _redirects

[netlify]

👷 Deploy request for craft-docs pending review.

Visit the deploys page to approve it

Name	Link
🔨 Latest commit	97de639

[AugustMiller]

This redirects to the addresses field type, but the more general address element page is actually here. Do you remember where you found the broken link?

[PerceiveWorld]

Thanks for checking. The source was #772, which only listed the legacy URL /docs/5.x/addresses.html without additional context.

I originally mapped it to the address field type page, but your point makes sense: the general address element page is the better redirect target for that legacy URL. I updated the redirect in 97de639 to point to /docs/5.x/reference/element-types/addresses.html.

[AugustMiller]

Oh gosh, sorry—I saw the pink/purple pixel avatar and assumed you had also reported this! 🤦 I'll get this merged today. I want to make sure this is also working via the version switcher menu from 4.x → 5.x. ✌️