Update mlir/docs/Tutorials/MlirOpt.md

Co-authored-by: Mehdi Amini <[email protected]>

Author: j2kun

mlir/docs/Tutorials/MlirOpt.md

@@ -155,7 +155,7 @@ the `mlir-opt` binary (located in `build/bin`)
 is the entry point for running passes and lowerings,
 as well as emitting debug and diagnostic data.
 
-Running `mlir-opt` with no flags will consume MLIR input
+Running `mlir-opt` with no flags will consume textual or bytecode IR
 from standard in, parse and run verifiers on it,
 and write the textual format back to standard out.
 This is a good way to test if an input MLIR is well-formed.