Update comment in 2-norm.
Update comment in 2-norm.

`tf.norm` uses a less-accurate and overflow-prone 2-norm computation compared to
`tf.math.reduce_euclidean_norm`.  Unfortunately, XLA doesn't support the `EuclideanNorm`
op, so we are stuck with this behavior (otherwise ResNet and several other TPU models
will fail to build due to the unsupported op).  If higher accuracy is required, use the
`tf.math.reduce_euclidean_norm` function directly.

See #53816 for some discussions.

PiperOrigin-RevId: 471438770

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