Fix two more “a”/“an” typos (this time the other way)

crates/hir_def/src/path/lower.rs

@@ -101,7 +101,7 @@ pub(super) fn lower_path(mut path: ast::Path, ctx: &LowerCtx) -> Option<Path> {
                 break;
             }
             ast::PathSegmentKind::SelfKw => {
-                // don't break out if `self` is the last segment of a path, this mean we got an
+                // don't break out if `self` is the last segment of a path, this mean we got a
                 // use tree like `foo::{self}` which we want to resolve as `foo`
                 if !segments.is_empty() {
                     kind = PathKind::Super(0);

crates/mbe/src/expander.rs

@@ -93,7 +93,7 @@ pub(crate) fn expand_rules(
 ///
 /// In other words, `Bindings` is a *multi* mapping from `SmolStr` to
 /// `tt::TokenTree`, where the index to select a particular `TokenTree` among
-/// many is not a plain `usize`, but an `&[usize]`.
+/// many is not a plain `usize`, but a `&[usize]`.
 #[derive(Debug, Default, Clone, PartialEq, Eq)]
 struct Bindings {
     inner: FxHashMap<SmolStr, Binding>,