sync run nightly install directions with Book

Signed-off-by: Dmitry Savintsev <dsavints@gmail.com>
2 years ago · 732b7ea930
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 ## Prerequisites

 1. Install a rust stable toolchain: `rustup install stable`
-1. Install a rust nightly toolchain: `rustup install nightly`
+1. Install a rust nightly toolchain with the rust-src component: `rustup toolchain install nightly --component rust-src`
 1. Install bpf-linker: `cargo install bpf-linker`

 ## Build eBPF