Unstable Book: update lang_items page and split it #113715
Merged
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lang_itemsrendered,startrenderedCloses #110274
Rustonomicon PR: rust-lang/nomicon#413, Rust Book PR: rust-lang/book#3705
A lot of information doesn't belong on the
lang_itemspage. I added a separate page for thestartfeature and moved some text into the Rustonomicon because thelang_itemspage should not be a tutorial on how to build a#![no_std]executable.The list of existing lang items is too long/unstable, so I removed it.
The doctests still don't work. :(