Rollup merge of #75371 - poliorcetics:intra-doc-links-std-time, r=jyn514
Rollup merge of #75371 - poliorcetics:intra-doc-links-std-time, r=jyn514

Move to doc links inside std/time.rs

Helps with #75080.

@rustbot modify labels: T-doc, A-intra-doc-links, T-rustdoc

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