[Edit] Python:NumPy NumPy - Built-in-functions - `.var()`

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We would like to edit the .var() term entry under NumPy. The entry lives in content/numpy/concepts/built-in-functions/terms/variance/variance.md

Please refer to the concept entry template, content standards and markdown style guide when working on the PR for this issue.

Please:

1. Add a ## Codebyte Example section that provides a codebyte example demonstrating the concept in use
2. Ensure that the codebyte example is different than all the other examples in the entry

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