message: Define the IR acronym
  * Define the IR acronym
  The acronym was being used without being defined. Thanks for letting me know what that stands for.
  * Adding space before the parenthesis
diff: @@ -39,7 +39,7 @@ Nothing in this specification should be construed as advocating one implementati
  ## ONNX Versioning
  -Versioning features in several places in ONNX -- the IR specification itself, the version of a model, and the version of an operator set. Furthermore, each individual operator indicates which version of its containing operator set it was introduced or stabilized in.
  +Versioning features in several places in ONNX -- the IR (Intermediate Representation) specification itself, the version of a model, and the version of an operator set. Furthermore, each individual operator indicates which version of its containing operator set it was introduced or stabilized in.
  Version numbers can be used as a simple number, or used to encode semantic versions. If using semver, the convention is to use the two most significant bytes for the major number, the next two bytes for the minor number, and the least significant four bytes for the build/bugfix number. When using semver versioning, at least one of the major/minor numbers MUST be non-zero.
  