DOC: Fix grammar in AUTHORS.md

[sangampaudel530]

This pull request fixes minor grammatical errors and improves clarity in the AUTHORS.md file to enhance the overall documentation quality. Thank you for considering this contribution!

[sangampaudel530]

Hello, Happy to Contribute first time in this repository !

[sangampaudel530]

Hi all, just a quick note , the current failing checks are due to unrelated dependency and docstring validation issues.
This PR only contains grammar fixes in author.md and does not affect the code or dependencies.
I kindly suggest these external issues be addressed separately so this documentation improvement can be merged smoothly.
Thank you very much for your time and understanding!

[jbrockmendel]

Can you revert the whitespace changes so it is easier to focus on the grammar

[sangampaudel530]

Thank you for the feedback!
I’ll revert the whitespace changes right away so the grammar fixes are clearer.

[sangampaudel530]

I've reverted the unintended whitespace changes and applied only the requested grammatical fixes to AUTHORS.md. Please let me know if any further changes are needed. Thank you for your guidance!

[jbrockmendel]

I'm now seeing nothing but whitespace changes.

[sangampaudel530]

Sorry for inconvenience, I think I have reverted the whitespace and made all the required grammar changes.

[mroeschke]

Thanks @sangampaudel530