fix docs (#427)

git-index/src/access.rs

@@ -70,7 +70,7 @@ impl State {
             .ok()
     }
 
-    /// Like [`entry_index_by_path_and_stage()`][File::entry_index_by_path_and_stage()],
+    /// Like [`entry_index_by_path_and_stage()`][State::entry_index_by_path_and_stage()],
     /// but returns the entry instead of the index.
     pub fn entry_by_path_and_stage(&self, path: &BStr, stage: entry::Stage) -> Option<&Entry> {
         self.entry_index_by_path_and_stage(path, stage)
@@ -79,7 +79,7 @@ impl State {
 
     /// Return the entry at `idx` or _panic_ if the index is out of bounds.
     ///
-    /// The `idx` is typically returned by [entry_by_path_and_stage()][File::entry_by_path_and_stage()].
+    /// The `idx` is typically returned by [entry_by_path_and_stage()][State::entry_by_path_and_stage()].
     pub fn entry(&self, idx: usize) -> &Entry {
         &self.entries[idx]
     }