[Triton-MLIR] Fix some typos (#874)

Fix some typos

python/tutorials/01-vector-add.py

@@ -63,7 +63,7 @@ def add(x: torch.Tensor, y: torch.Tensor):
     grid = lambda meta: (triton.cdiv(n_elements, meta['BLOCK_SIZE']),)
     # NOTE:
     #  - each torch.tensor object is implicitly converted into a pointer to its first element.
-    #  - `triton.jit`'ed functions can be index with a launch grid to obtain a callable GPU kernel
+    #  - `triton.jit`'ed functions can be indexed with a launch grid to obtain a callable GPU kernel
     #  - don't forget to pass meta-parameters as keywords arguments
     add_kernel[grid](x, y, output, n_elements, BLOCK_SIZE=1024)
     # We return a handle to z but, since `torch.cuda.synchronize()` hasn't been called, the kernel is still