Fix `cargo doc` warnings.
Use code blocks for shell commands.
Display a URL correctly.
Use backticks to prevent `argv[0]` from looking like an intra-doc link.
@@ -8,7 +8,7 @@ use std::path::PathBuf;
///
/// The binary must be a statically linked position-independent executable,
/// compiled with flags like `-nostdlib -static-pie -fPIC`. No commandline
-/// arguments are passed, the program's argv[0] will be `/init`, and the
+/// arguments are passed, the program's `argv[0]` will be `/init`, and the
/// environment is empty except for `LANG=C`.
///
/// This subcommand is hidden from the main help because it's unlikely to be
