fix typo

Author: clementval

mlir/include/mlir/Dialect/LLVMIR/NVVMOps.td

@@ -1241,7 +1241,7 @@ def NVVM_MembarOp : NVVM_Op<"memory.barrier">,
   let summary = "Memory barrier operation";
   let description = [{
     `membar` operation guarantees that prior memory accesses requested by this
-    thread are performed at the specified `level`, before later memory
+    thread are performed at the specified `scope`, before later memory
     operations requested by this thread following the membar instruction.
 
     [For more information, see PTX ISA](https://docs.nvidia.com/cuda/parallel-thread-execution/#parallel-synchronization-and-communication-instructions-membar)