Add t stochastic neighbour embedding using Iris dataset (#13476)

* Added t-SNE with Iris dataset example

* Added t-SNE with Iris dataset example

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* Updated with descriptive variables

* Add descriptive variable names

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* Add Descriptive Variable names

* Adding Descriptive variable names

* Update machine_learning/t_stochastic_neighbour_embedding.py

Co-authored-by: Christian Clauss <[email protected]>

* Update machine_learning/t_stochastic_neighbour_embedding.py

Co-authored-by: Christian Clauss <[email protected]>

* Improved line formatting

* Adding URL for t-SNE Wikipedia

* Apply suggestion from @cclauss

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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Christian Clauss <[email protected]>