Ensure embed fields are inline by default
Ensure embed fields are inline by default

90% of use cases require embed fields to be inlined, so it's a better
default.

Also this makes the documentation accurate.

Flat/serenity,zeyla/serenity,Roughsketch/serenity,Lakelezz/serenity,zeyla/serenity.rs,eLunate/serenity,acdenisSK/serenity