Auto merge of #30901 - mackwic:doc-core-convert, r=steveklabnik
Auto merge of #30901 - mackwic:doc-core-convert, r=steveklabnik

Also add a note about the necessary simplicity of the conversion.
Related issue: #29349

r? @steveklabnik

GBGamer/rust,GBGamer/rust,GBGamer/rust,GBGamer/rust,GBGamer/rust,aidancully/rust,graydon/rust,GBGamer/rust,aidancully/rust,graydon/rust,aidancully/rust,graydon/rust,aidancully/rust,aidancully/rust,aidancully/rust,GBGamer/rust,GBGamer/rust,graydon/rust,graydon/rust,graydon/rust