P4TB-393: Fix typo in commit 8f93f37a.

addon/content/pepmsghdrview.js

@@ -277,7 +277,7 @@ var pEpHdrView = {
 
       // Make a fake message, we only need the from.
       let message = new pEp.Message(msgHdr.messageId, "test", "", data.other);
-      // Move the other guys FPR to the front, the engine likes it this way.
+      // Move the other guy's FPR to the front, the engine likes it this way.
       let fpr = data.other.fpr;
       let ind = keyList.indexOf(fpr);
       if (ind > 0) {