Add NumPy ndarray .dot() method documentation with syntax, examples, …

[Aggarwalmansi]

This PR adds a new entry for the .dot() method under NumPy ndarray in content/numpy/concepts/ndarray/terms/dot/dot.md
It includes:

A detailed explanation of the method and its use cases

Syntax and parameter details

Examples demonstrating different input dimensions

A compilable Codebyte example for interactive learning

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1 out of 2 committers have signed the CLA.

✅ Aggarwalmansi
❌ Mansi Agarwal

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[mamtawardhani]

Closing this as a different author is assigned to this issue. @Aggarwalmansi - for future reference, please first comment on an issue to claim it and once it has been assigned to you, only then raise a PR