GH-752 updated documentation to show rename workaround

man/git-reauthor.md

@@ -66,6 +66,10 @@ Change only the committer email of Jack (keep the author email already used)
 
     $ git reauthor --old-email [email protected] --correct-email [email protected] --type committer
 
+Change only the name and keep email to merge one user with multiple pseudonyms.
+
+    $ git reauthor --old-email [email protected] --correct-name Jack
+
 Set Jack's identity as the only one of the whole repository
 
     $ git reauthor --all --correct-email [email protected] --correct-name Jack