DOC: Fix Exception message suggestion

The suggested member function does not exist.  Use one of the two
available member functions to suggest the correct behavior for
using the reference image information.

Modules/Filtering/ImageGrid/include/itkResampleImageFilter.hxx

@@ -107,8 +107,8 @@ ResampleImageFilter<TInputImage, TOutputImage, TInterpolatorPrecisionType, TTran
   const ReferenceImageBaseType * const referenceImage = this->GetReferenceImage();
   if (this->m_Size[0] == 0 && referenceImage && !m_UseReferenceImage)
   {
-    itkExceptionMacro("Output image size is zero in all dimensions.  Consider using SetUseReferenceImageOn()."
-                      "to define the resample output from the ReferenceImage.");
+    itkExceptionMacro("Output image size is zero in all dimensions.  Consider using UseReferenceImageOn()."
+                      "or SetUseReferenceImage(true) to define the resample output from the ReferenceImage.");
   }
 }