[Easy] Fix linalg.norm hint message typo (pytorch#144323)

Fixes pytorch#136454

**Test Result**

**Before**

```python
>>> import torch
>>> from torch import linalg
>>>
>>> my_tensor = torch.tensor([[[8., -3., 0., 1.]]])
>>>                            # ↓ ↓ ↓ ↓ ↓
>>> linalg.norm(input=my_tensor, ord='fro', dim=(0, 1, 2)) # Error
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
RuntimeError: linalg.norm: If dim is specified, it mut be of length 1 or 2. Got [0, 1, 2]
>>>                            # ↓ ↓ ↓ ↓ ↓
>>> linalg.norm(input=my_tensor, ord='nuc', dim=(0, 1, 2)) # Error
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
RuntimeError: linalg.norm: If dim is specified, it mut be of length 1 or 2. Got [0, 1, 2]

```

**After**

```python
>>> import torch
>>> from torch import linalg
>>>
>>> my_tensor = torch.tensor([[[8., -3., 0., 1.]]])
>>>                            # ↓ ↓ ↓ ↓ ↓
>>> linalg.norm(input=my_tensor, ord='fro', dim=(0, 1, 2)) # Error
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
RuntimeError: linalg.norm: If dim is specified, it must be of length 1 or 2. Got [0, 1, 2]
>>>                            # ↓ ↓ ↓ ↓ ↓
>>> linalg.norm(input=my_tensor, ord='nuc', dim=(0, 1, 2)) # Error
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
RuntimeError: linalg.norm: If dim is specified, it must be of length 1 or 2. Got [0, 1, 2]

```

Pull Request resolved: pytorch#144323
Approved by: https://github.com/Skylion007, https://github.com/soulitzer

Author: zeshengzong

aten/src/ATen/native/LinearAlgebra.cpp

@@ -3037,7 +3037,7 @@ Tensor& linalg_norm_out(const Tensor& X, const std::optional<Scalar>& opt_ord, O
 Tensor linalg_norm(const Tensor& X, std::string_view ord, OptionalIntArrayRef opt_dim, bool keepdim, std::optional<ScalarType> opt_dtype) {
   if (opt_dim.has_value()) {
     TORCH_CHECK(opt_dim->size() == 1 || opt_dim ->size() == 2, "linalg.norm: If ",
-              "dim is specified, it mut be of length 1 or 2. Got ", *opt_dim);
+              "dim is specified, it must be of length 1 or 2. Got ", *opt_dim);
   } else {
     TORCH_CHECK(X.dim() == 1 || X.dim() == 2, "linalg.norm: If ",
                 "dim is not specified but ord is, the input must be 1D or 2D. Got ", X.dim(), "D.");