How to deal with pages that are missing in this new version of the docs?

There are multiple broken links in the `dev` version of the docs that link to pages that used to be there but are not in the current version.

Examples:

• /docs/en/dev/guide/platforms/ios/upgrade.html links to /docs/en/dev/guide/platforms/ios/tools.html in multiple places
• /docs/en/dev/guide/platforms/windows/index.html (used to be /docs/en/dev/guide/platforms/win8/index.html) links to /docs/en/dev/guide/platforms/wp8/index.html

How can and should those be handled?
The content still exists, but in older versions :/