assembler: SourceInfo doc comment added to self.module.

assembler/src/source/source_info.rs

@@ -22,6 +22,7 @@ use crate::{
 pub struct SourceInfo {
     /// The line number within the source file underpinned by `module_id`.
     pub line_number: usize,
+    /// The [`Module`] the source code is associated with.
     pub module: Arc<Module>,
     /// The indexes where this token may be found (line-local).
     pub span: std::ops::Range<usize>,