🔗 link fix: better link

[nermalcat69]

As I was going through rust's documentation and when i clicked on the "in the standard library documentation" i got confused then after some exploring i found the right link and i think ../std/index.html is better.

Mentioning the prelude link is not conventional, as its mentioned "in the standard library documentation"

Changes i made

1. Added stdlib (../std/index.html) which leads to ../std/index.html`](https://doc.rust-lang.org/std/index.html
2. Added prelude link to the prelude (../std/prelude/index.html) text which leads to https://doc.rust-lang.org/std/prelude/index.html

[nermalcat69]

The text will be something like this

By default, Rust has a set of items defined in the standard library that it brings into the scope of every program. This set is called the prelude, and you can see everything in it in the standard library documentation.

[nermalcat69]

closing this pr