Completed concept entry for Postgresql operator-invocations #4764

[nbarnhouse]

Description

Completed concept entry for Postgresql operator-invocations

Issue Solved

Closes Issue #4649

Type of Change

• Adding a new entry

Checklist

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

[nbarnhouse]

Submitted this to fix error in https://github.com/Codecademy/docs/pull/4764. ++ @cigar-galaxy82

[cigar-galaxy82]

Hi @nbarnhouse

Thank you for contributing to Codecademy docs. I have suggested a few changes please modify

[nbarnhouse]

Thank you @cigar-galaxy82. I have made updates based on your comments.

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