Accept changes from updated error message

Author: ahejlsberg

tests/baselines/reference/functionImplementationErrors.errors.txt

@@ -1,4 +1,4 @@
-tests/cases/conformance/functions/functionImplementationErrors.ts(25,16): error TS2355: A function whose declared type is neither 'void' nor 'any' must return a value.
+tests/cases/conformance/functions/functionImplementationErrors.ts(25,16): error TS2355: A function whose declared type is neither 'undefined', 'void', nor 'any' must return a value.
 tests/cases/conformance/functions/functionImplementationErrors.ts(30,17): error TS2373: Parameter 'n' cannot reference identifier 'm' declared after it.
 tests/cases/conformance/functions/functionImplementationErrors.ts(35,17): error TS2373: Parameter 'n' cannot reference identifier 'm' declared after it.
 tests/cases/conformance/functions/functionImplementationErrors.ts(40,1): error TS2839: This condition will always return 'false' since JavaScript compares objects by reference, not value.
@@ -31,7 +31,7 @@ tests/cases/conformance/functions/functionImplementationErrors.ts(40,1): error T
     // Function implemetnation with non -void return type annotation with no return
     function f5(): number {
                    ~~~~~~
-!!! error TS2355: A function whose declared type is neither 'void' nor 'any' must return a value.
+!!! error TS2355: A function whose declared type is neither 'undefined', 'void', nor 'any' must return a value.
     }
 
     var m;