message: Update IR.md
  Fix wrong doc link
diff: @@ -336,7 +336,7 @@ The following types are used to define the types of graph and node inputs and ou
  ONNX|dense tensors|Tensors are a generalization of vectors and matrices; whereas vectors have one dimension, and matrices two, tensors can have any number of dimensions, including zero. A zero-dimensional tensor is logically equivalent to a scalar value.
  ONNX|sequence|Sequences are dense, ordered, collections of elements that are of homogeneous types.
  ONNX|map|Maps are associative tables, defined by a key type and a value type.
  -ONNX|optional|Optionals are wrappers that may contain an element of tensor, sequence, or map type, or may be empty (containing none). [Details](docs/ONNXTypes.md)
  +ONNX|optional|Optionals are wrappers that may contain an element of tensor, sequence, or map type, or may be empty (containing none). [Details](ONNXTypes.md)
  #### Static tensor shapes
  