Update state_machine_design_pattern.ipynb

[Gjacquenot]

Summary by Sourcery

Documentation:

• Fix typo in exceptions description from "The are all derived" to "They are all derived".

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Reviewer's Guide

This PR fixes a grammar typo in the state_machine_design_pattern.ipynb by replacing an erroneous article with the correct pronoun in the exception description.

File-Level Changes

Change	Details	Files
Fixed grammatical error in exception description	Replaced "The are all derived" with "They are all derived"	source-code/design-patterns/state_machine_design_pattern.ipynb

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[sourcery-ai]

Hey @Gjacquenot - I've reviewed your changes and they look great!

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