Wraps up refs #2719

Author: JJ

doc/Type/CallFrame.pod6

@@ -136,7 +136,8 @@ Returns a L<CallFrame|/type/CallFrame> object for the given level. If no level
 is given, the default level is 0. Positive levels move up the frame stack and
 negative levels move down (into the call to C<callframe> and deeper).
 
-Returns L<Mu|/type/Mu> if there is no call information for the given level. Negative levels may result in an exception.
+Returns L<Mu|/type/Mu> if there is no call information for the given level.
+Negative levels may result in an exception.
 
 =end pod