Fix: resolves issue #800 by updating lesson-2.pdf

[ManishVarma4]

Summary

This pull request addresses issue #800 by improving the clarity of a confusing sentence in the History of Machine Learning page, under the section Notable discoveries.

Original sentence:

"1763, 1812 and its predecessors. This theorem and its applications underlie inference, describing the probability of an event occurring based on prior knowledge."

Suggested improved sentence:

"Bayes' Theorem, first published in 1763 and later refined by Pierre-Simon Laplace in 1812, underlies statistical inference by describing how to update the probability of an event based on prior knowledge and new evidence."

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Changes made:

• Updated the confusing sentence for clarity and accuracy
• Improved the explanation of Bayes' Theorem in the context of machine learning history

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Please review and let me know if any further improvements are needed. Thanks!