std: Update crate docs

[brson]

Attempted to organize them in a way more relevant to what newbies
would be interested in hearing.

I am not satisfied by this at all, but by virtue of deleting old links alone I think it is an improvement.

r? @steveklabnik

[echochamber]

The rust standard library is available to all rust crates by default, just as if...

Small wording suggestion that I think makes this more newbie friendly :)

Also, as a newbie, I don't quite understand what "crate-level" means in this context? As far as my understanding goes, there's no way to automatically have extern crate some_crate for all modules in a crate (besides the std library), but its very possible I am mistaken.

[steveklabnik]

It means 'in your crate root', which is how we usually say it. i'd update it to that wording.

[echochamber]

Hey, was originally just going to weigh in my perspective as a rust newbie on your changes, but ended up doing a proofread also. Sorry if my comments are pedantic!

[echochamber]

Is it correct to refer to ::std as a path or a namespace or are both correct?

[steveklabnik]

both are, i'd say

[steveklabnik]

After a few nits, r=me. I've also thought this could be improved but was never really satisfied with how to do so.

[steveklabnik]

@bors: r+ rollup

[bors]

📌 Commit 6ebba71 has been approved by steveklabnik