Tweak description of the disable_urandom_fallback feature

Author: newpavlov

Cargo.toml

@@ -32,8 +32,8 @@ wasm-bindgen-test = "0.3.18"
 [features]
 # Implement std-only traits for getrandom::Error
 std = []
-# Disable `/dev/urandom` fallback for Linux targets
-# (bumps minimum supported Linux kernel version to 4.17)
+# Disable `/dev/urandom` fallback for Linux and Android targets.
+# Bumps minimum supported Linux kernel version to 3.17 and Android API level to 23 (Marshmallow).
 disable_urandom_fallback = []
 # Feature to enable fallback RDRAND-based implementation on x86/x86_64
 rdrand = []