Update src/onnx/parse_if.cpp

fix comment for sub graph throw
Co-authored-by: kahmed10 <15948690+kahmed10@users.noreply.github.com>

src/onnx/parse_if.cpp

@@ -110,7 +110,7 @@ struct parse_if : op_parser<parse_if>
             if(then_out_shape.type() != else_out_shape.type())
             {
                 MIGRAPHX_THROW("PARSE_IF: " + info.name +
-                               " then and else sub_grahps must have same output type! " +
+                               " then and else sub_graphs must have same output type! " +
                                then_out_shape.type_string() + " vs " +
                                else_out_shape.type_string());
             }