A small wording change in the README

README.md

@@ -46,7 +46,7 @@ Iron has been built and tested with the following dependencies
   * The definition of the heap in terms of ghost state from Section 6 is in
     [theories/heap_lang/heap.v](theories/heap_lang/heap.v) as `heapG`. So too
     are the definitions of ↦ and 𝖊 (in the formalization called `perm`).
-  * The theorems stated in Section 6 about updates to the heap ghost
+  * The theorems mentioned in Section 6 about updates to the heap ghost
     state are proven in [theories/heap_lang/heap.v](theories/heap_lang/heap.v).
   * The state interpretation from Section 6 is defined in
     [theories/heap_lang/heap.v](theories/heap_lang/heap.v) as `heap_ctx`.