hg-core: minor docstring update (D8958#inline-14991 followup)

Differential Revision: https://phab.mercurial-scm.org/D9097

rust/hg-core/src/revlog/index.rs

@@ -126,7 +126,7 b" pub struct IndexEntry<'a> {"
 }
 
 impl<'a> IndexEntry<'a> {
-    /// Return the offset of the data if not overridden by offset_override.
+    /// Return the offset of the data.
     pub fn offset(&self) -> usize {
         if let Some(offset_override) = self.offset_override {
             offset_override