Update a doc comment for pub mod sigma

sigma_compiler_core/src/lib.rs

@@ -1,8 +1,8 @@
 use proc_macro2::TokenStream;
 
 /// The submodules that would be useful to have in the lower-level
-/// `sigma` crate are for now included as submodules of a local `sigma`
-/// module
+/// `sigma-rs` crate are for now included as submodules of a local
+/// `sigma` module.
 pub mod sigma {
     pub mod codegen;
     pub mod combiners;