docs(Relativity): correct the CoVector rep docstring to say covectors

[williamjblair]

Closes #1495.

The docstring on Lorentz.CoVector.rep says the representation acts on Lorentz vectors. It acts on CoVector d. The same line sits above Lorentz.Vector.rep in Physlib/Relativity/Tensors/RealTensor/Vector/Representation.lean, where it is correct, so this looks like a copy where the type changed and the docstring did not.

Docstring only, no declarations added or removed

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[jstoobysmith]

Looks great - approved, many thanks

[jstoobysmith]

Thanks for these first pull requests! Hope they are the first of many 🎉

[williamjblair]

Absolutely, hope to contribute much more - thanks!