Update pull request review quickstart guide instructions

[ashis-baral]

Why:

Fix: #45851

What's being changed (if available, include any code snippets, screenshots, or gifs):

Updated the “Submit your review” section of the Review Quickstart guide to reflect the current GitHub UI.

The documentation currently instructs users to click Review changes, but the current UI uses Submit review. This change updates the instruction so that it matches the current interface and avoids confusion for users following the guide.

Check off the following:

• A subject matter expert (SME) has reviewed the technical accuracy of the content in this PR. In most cases, the author can be the SME. Open source contributions may require an SME review from GitHub staff.
• The changes in this PR meet the docs fundamentals that are required for all content.
• All CI checks are passing and the changes look good in the review environment.

[github-actions]

How to review these changes 👓

Thank you for your contribution. To review these changes, choose one of the following options:

• Spin up a codespace
• Set up a local development environment

A Hubber will need to deploy your changes internally to review.

Table of review links

Note: Please update the URL for your staging server or codespace.

The table shows the files in the content directory that were changed in this pull request. This helps you review your changes on a staging server. Changes to the data directory are not included in this table.

Source	Review	Production	What Changed
pull-requests/get-started/reviewing-pull-requests-quickstart.md	fpt ghec ghes@ 3.22 3.21 3.20 3.19 3.18 3.17	fpt ghec ghes@ 3.22 3.21 3.20 3.19 3.18 3.17

Key: fpt: Free, Pro, Team; ghec: GitHub Enterprise Cloud; ghes: GitHub Enterprise Server

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[reelsimeon]

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