[mlir][tosa] Align RFFT2d and FFT2d operator examples (#135261)

* Minor variable name alignment

Signed-off-by: Jerry Ge <[email protected]>

Author: Jerry-Ge

mlir/include/mlir/Dialect/Tosa/IR/TosaOps.td

@@ -271,7 +271,7 @@ def Tosa_FFT2dOp : Tosa_InferShapedTypeOp<"fft2d", [
     Example:
 
     ```mlir
-     %out_real, %out_imag = tosa.fft2d %in_real, %in_imag : (tensor<8x9xf32>, tensor<8x9xf32>) -> (tensor<8x9xf32>, tensor<8x9xf32>)
+     %output_real, %output_imag = tosa.fft2d %input_real, %input_imag : (tensor<8x9xf32>, tensor<8x9xf32>) -> (tensor<8x9xf32>, tensor<8x9xf32>)
     ```
   }];
 
@@ -394,7 +394,7 @@ def Tosa_RFFT2dOp : Tosa_InferShapedTypeOp<"rfft2d", [
     Example:
 
     ```mlir
-     %real, %imag = tosa.rfft2d %in : (tensor<8x16xf32>) -> (tensor<8x9xf32>, tensor<8x9xf32>)
+     %ouput_real, %output_imag = tosa.rfft2d %input_real : (tensor<8x16xf32>) -> (tensor<8x9xf32>, tensor<8x9xf32>)
     ```
   }];