[mlir][tosa] Align AbsOp example variable names

* Minor example variable name alignment

Signed-off-by: Jerry Ge <[email protected]>
Change-Id: I6d48ec183ed1880ef83f65dfde8d5555d834116d

Author: Jerry-Ge

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

@@ -1131,7 +1131,7 @@ def Tosa_AbsOp : Tosa_ElementwiseUnaryOp<"abs"> {
     Example:
 
     ```mlir
-    %out = tosa.abs(%in) : (tensor<21x3xf32>) -> tensor<21x3xf32>
+    %output = tosa.abs(%input1) : (tensor<21x3xf32>) -> tensor<21x3xf32>
     ```
   }];