Docs: Corret hkdf docs in hazardous
// SOFTWARE.
//! # Parameters:
-//! - `salt`: Salt value (can be made from an empty slice).
+//! - `salt`: Salt value.
//! - `ikm`: Input keying material.
//! - `info`: Optional context and application specific information. If `None` then it's an empty string.
//! - `dst_out`: Destination buffer for the derived key. The length of the derived key is implied by the length of `okm_out`.
//! - The length of `dst_out` is less than 1.
//! - The length of `dst_out` is greater than 255 * hash_output_size_in_bytes.
//! - The derived key does not match the expected when verifying.
-//! - The slice is greater than 128 bytes when calling `Salt::from_slice()`.
//!
//! # Security:
-//! - Salts should always be generated using a CSPRNG. `Salt::generate()` can be used for this.
-//! It generates a salt of 64 bytes.
+//! - Salts should always be generated using a CSPRNG. `util::secure_rand_bytes()` can be used for this.
//! - The recommended length for a salt is 64 bytes.
//! - Even though a salt value is optional, it is strongly recommended to use one.
//! - HKDF is not suitable for password storage.
