Apply suggestions from code review

Co-Authored-By: Oliver Scherer <github35764891676564198441@oli-obk.de>

Author: RalfJung

src/operator.rs

@@ -193,7 +193,7 @@ impl<'mir, 'tcx> EvalContextExt<'tcx> for super::MiriEvalContext<'mir, 'tcx> {
                     // on read hardware this can easily happen. Thus for comparisons we require
                     // both pointers to be live.
                     if self.pointer_inbounds(left).is_ok() && self.pointer_inbounds(right).is_ok() {
-                        // Two in-bounds pointers in different allocatons are different.
+                        // Two in-bounds pointers in different allocations are different.
                         false
                     } else {
                         return err!(InvalidPointerMath);

tests/compile-fail/zst3.rs

@@ -7,7 +7,7 @@ fn main() {
     // (that are out-of-bounds).
     let mut x_box = Box::new(1u8);
     let x = (&mut *x_box as *mut u8).wrapping_offset(1);
-    // This one is just "at the egde", but still okay
+    // This one is just "at the edge", but still okay
     unsafe { *(x as *mut [u8; 0]) = zst_val; }
     // One byte further is OOB.
     let x = x.wrapping_offset(1);