Replace incorrect term "parent modules" with "ancestor modules".
"Parent" means the first level above, "ancestors" means all the levels above.
@@ -48,7 +48,7 @@ With the notion of an item being either public or private, Rust allows item
accesses in two cases:
1. If an item is public, then it can be accessed externally from some module
- `m` if you can access all the item's parent modules from `m`. You can
+ `m` if you can access all the item's ancestor modules from `m`. You can
also potentially be able to name the item through re-exports. See below.
2. If an item is private, it may be accessed by the current module and its
descendants.
