Oops, fix typo, MasterDuke++

Author: lizmat

doc/Language/5to6-perlvar.pod6

@@ -109,7 +109,7 @@ and therefore can be used either within a string
 or a numeric context (this is similar to how the group
 information is handled by the C<$*GROUP> object).
 The user id is therefore obtained via C<+$*USER>, while the
-username via C<~$*USE>.
+username via C<~$*USER>.
 
 =item $EFFECTIVE_USER_ID