Added new Managing dependencies section, fixed one typo

[harish-s-developer]

I have added a new Managing dependencies section illustrating the creation of requirements.txt file and reusing it while setting up another virtual environment.

[harish-s-developer]

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[ntrogh]

@cwebster-99 Can you review this PR for the Python tutorial?

[ntrogh]

@harish-s-developer Thanks for contributing. I've added a couple text formatting suggestions.

[ntrogh]

LGTM!

[cwebster-99]

Thanks for adding this to our docs, I think it is a great inclusion! Added some comments around restructuring this to better fit in the flow of the tutorial.

[cwebster-99]

LGTM! Thanks for the contribution!