message: Fix doc of Evaluator::codemap field
diff: @@ -74,7 +74,7 @@ pub struct Evaluator<'v, 'a> {
  pub(crate) globals: &'a Globals,
  // How we deal with a `load` function.
  pub(crate) loader: Option<&'a dyn FileLoader>,
  - // The codemap that corresponds to this module.
  + // The codemap that corresponds to currently executed function.
  pub(crate) codemap: &'v CodeMap,
  // Should we enable heap profiling or not
  pub(crate) heap_profile: HeapProfile,
  