[Concept Entry] Postgresql window-functions #4591

[Johnnie-kay]

Description

• Created a new concept entry for Postgresql window functions.
• Closes issue [Concept Entry] Postgresql window-functions #4591

Type of Change

• Adding a new entry
• Updating the documentation

Checklist

• All writings are my own.
• My entry follows the Codecademy Docs style guide.
• My changes generate no new warnings.
• I have performed a self-review of my own writing and code.
• I have checked my entry and corrected any misspellings.
• I have made corresponding changes to the documentation if needed.
• I have confirmed my changes are not being pushed from my forked main branch.
• I have confirmed that I'm pushing from a new branch named after the changes I'm making.
• I have linked any issues that are relevant to this PR in the Issues Solved section.

[CLAassistant]

All committers have signed the CLA.

[SaviDahegaonkar]

Hello Author, I have suggested a few changes in the file and corrected some minor mistakes accordingly. Please have a look at it and please let me know.
Thanks!

[SaviDahegaonkar]

Suggested change

	Window functions are defined using an `OVER` clause that specifies how to partition and order rows for the function to operate on, this clause is what makes the window function different from normal aggregate function.
	Window functions are defined using an `OVER` clause that specifies how to partition and order rows for the function to operate on, this clause is what makes the window function different from the normal aggregate function.

[Johnnie-kay]

Hello @SaviDahegaonkar, all corrections and suggestions have been attended to.

[Johnnie-kay]

I have reviewed the window-functions.md file and made all corrections

[github-actions]

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