Improve phrasing

  - Avoid ambiguous 'it'
  - Avoid 'should'

wiki/src/inc/release_notes/1.6.mdwn

@@ -11,8 +11,8 @@ are listed in the [Changelog](https://git-tails.immerda.ch/tails/plain/debian/ch
 ## Fixed problems
 
   - Fix several issues related to *MAC address spoofing*:
-    * If MAC address spoofing fails for some network interface *and*
-      it cannot be disabled afterwards, networking should now be
+    * If MAC address spoofing fails on a network interface and
+      this interface cannot be disabled, then the networking is now
       completely disabled.
     * If MAC address spoofing causes network issues (e.g. due to the
       access point blocking all but whitelisted MAC addresses) a