fix comments

Author: RalfJung

src/librustc_mir/interpret/machine.rs

@@ -171,7 +171,8 @@ pub trait Machine<'a, 'mir, 'tcx>: Sized {
     /// cache the result. (This relies on `AllocMap::get_or` being able to add the
     /// owned allocation to the map even when the map is shared.)
     ///
-    /// The tag returned must be the same as the one returned by `tag_base_pointer`.
+    /// For static allocations, the tag returned must be the same as the one returned by
+    /// `tag_static_base_pointer`.
     fn tag_allocation<'b>(
         id: AllocId,
         alloc: Cow<'b, Allocation>,

src/librustc_mir/interpret/memory.rs

@@ -326,7 +326,7 @@ impl<'a, 'mir, 'tcx, M: Machine<'a, 'mir, 'tcx>> Memory<'a, 'mir, 'tcx, M> {
     /// The resolved ID is never used by the interpreted progrma, it is hidden.
     /// The `AllocKind::Memory` branch here is still reachable though; when a static
     /// contains a reference to memory that was created during its evaluation (i.e., not to
-    /// another static), those inner references only exist in "resolved" from.
+    /// another static), those inner references only exist in "resolved" form.
     fn get_static_alloc(
         id: AllocId,
         tcx: TyCtxtAt<'a, 'tcx, 'tcx>,