Documentation: Inclusion of a docstring for the check_amazon_availabi…

[MarcoA-Pozol]

Type of change

• Added new project
• Bug fix
• New features
• [✔ ] Enhanced documentation

Changes proposed in this pull request

• Project name :Amazon Amazon Product Availbility

• Short description : I included a few lines into the docstring of the function that checks for products availability to let the user know and understand how the function works to insert the neccesary parameters for the function.

Checklist

• [✔ ] The code is Python 3 compatible
• [✔ ] I have added relevant comments in my file to make code understandable
• [✔ ] I have added my project in a folder which includes all the necessary files

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