Tweak docs

src/rngs/small.rs

@@ -47,6 +47,13 @@ type Rng = super::xoshiro256plusplus::Xoshiro256PlusPlus;
 ///     let rng = SmallRng::from_rng(&mut rand::rng());
 ///     # let _: SmallRng = rng;
 ///     ```
+///     or [`SeedableRng::from_os_rng`]:
+///     ```
+///     # use rand::SeedableRng;
+///     # use rand::rngs::SmallRng;
+///     let rng = SmallRng::from_os_rng();
+///     # let _: SmallRng = rng;
+///     ```
 /// 2.  To use a deterministic integral seed, use `seed_from_u64`. This uses a
 ///     hash function internally to yield a (typically) good seed from any
 ///     input.

src/rngs/std.rs

@@ -44,7 +44,7 @@ use rand_chacha::ChaCha12Rng as Rng;
 /// # let _: StdRng = rng;
 /// ```
 ///
-/// Seeding via [`rand::rng`] may be faster:
+/// Seeding via [`rand::rng()`](crate::rng()) may be faster:
 /// ```
 /// # use rand::{SeedableRng, rngs::StdRng};
 /// let rng = StdRng::from_rng(&mut rand::rng());