dimforge / dimforge/nalgebra

`normalize` docs need expansion

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Description

When examining [`Matrix::normalize`](https://docs.rs/nalgebra/latest/nalgebra/base/struct.Matrix.html#method.normalize)
, I have a few questions:

1. What exactly do you mean by "normalization" here? Does this correspond to setting the length of a vector to 1?
2. What happens with 0-length vectors (or their matrix equivalents)? Does nothing happen? Does it panic? Do we get infinities / NaN values?

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