Fix old doc reference

src/prng.rs

@@ -2,9 +2,9 @@
 //! by seeding them with data obtained from the [`crate::hwrng`] module.
 //!
 //! At the moment two prngs are available: [`rand::rngs::StdRng`] and [`crate::random::Random`].
-//! Both of these claim to be cryptographic secure prngs. Provided of course the seeds from `hwrng`
-//! are secure to begin with, which drastically depends on the board used, see remarks in [`crate::hwrng`] module!
-
+//! Both of these claim to be cryptographic secure prngs. Provided the seeds from RIOTs HWRNG that are used
+//! provide enough entropy to begin with, which drastically depends on the board used,
+//! see remarks in [RIOTs documentation](https://doc.riot-os.org/group__drivers__periph__hwrng.html).
 
 use embedded_hal::prelude::_embedded_hal_blocking_rng_Read;
 use rand::{rngs::StdRng, SeedableRng};
@@ -14,7 +14,7 @@ use crate::{
     random::{Random, RandomSeed},
 };
 
-/// Seeds a [`crate::random::Random`] prng with a 32bit seed generated by [`crate::hwrng::HWRNG`].
+/// Seeds a [`crate::random::Random`] prng with a 32 byte seed generated by RIOTs HWRNG.
 ///
 /// See this modules description regarding quality of the used seeds.
 ///
@@ -27,7 +27,7 @@ pub fn riot_prng() -> Random<32> {
     Random::<32>::from_seed(RandomSeed::new_from_hwrng())
 }
 
-/// Seeds a [`rand::rngs::StdRng`] prng with a 32bit seed generated by [`crate::hwrng::HWRNG`].
+/// Seeds a [`rand::rngs::StdRng`] prng with a 32 byte seed generated by RIOTs HWRNG.
 ///
 /// See this modules description regarding quality of the used seeds.
 pub fn rand_prng() -> StdRng {