Add doc comments

src/scalar_mul/mod.rs

@@ -8,6 +8,14 @@
 // - Isis Agora Lovecruft <isis@patternsinthevoid.net>
 // - Henry de Valence <hdevalence@hdevalence.ca>
 
+//! Implementations of various scalar multiplication algorithms.
+//!
+//! Note that all of these implementations use serial code for field
+//! arithmetic with the multi-model strategy described in the
+//! `curve_models` module.  The vectorized AVX2 backend has its own
+//! scalar multiplication implementations, since it only uses one
+//! curve model.
+
 pub mod window;
 
 pub mod variable_base;

src/scalar_mul/straus.rs

@@ -8,6 +8,8 @@
 // - Isis Agora Lovecruft <isis@patternsinthevoid.net>
 // - Henry de Valence <hdevalence@hdevalence.ca>
 
+//! Implementation of the interleaved window method, also known as Straus' method.
+
 #![allow(non_snake_case)]
 
 use core::borrow::Borrow;