Many broken intra-doc links

[kangalio]

On fluent current doc front page, there are a lot of broken intra-doc links:

• https://docs.rs/fluent/latest/fluent/struct.FluentBundle.html
• https://docs.rs/fluent/latest/fluent/struct.FluentResource.html
• https://docs.rs/fluent/latest/fluent/struct.FluentMessage.html
• https://docs.rs/fluent/latest/fluent/type.FluentArgs.html
• https://docs.rs/fluent/latest/fluent/struct.FluentValue.html
• https://docs.rs/fluent/latest/fluent/intl_memoizer::IntlLangMemoizer