Rollup merge of #78923 - jyn514:intra-doc-comments, r=Manishearth
Rollup merge of #78923 - jyn514:intra-doc-comments, r=Manishearth

Cleanup and comment intra-doc link pass

r? ```@Manishearth```
cc ```@seeplusplus```

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