Tweak docs

Author: newpavlov

src/lib.rs

@@ -232,7 +232,7 @@ cfg_if! {
             target_os = "android",
             all(
                 target_os = "linux",
-                // Only on these architectures Rust supports Linux kernel versions (3.2+)
+                // Only on these `target_arch`es Rust supports Linux kernel versions (3.2+)
                 // that precede the version (3.17) in which `getrandom(2)` was added:
                 // https://doc.rust-lang.org/stable/rustc/platform-support.html
                 any(