docs: improve the “preparing a release” steps

[compojoom]

What it solves

When preparing the last release I was not sure how to notify QA about it. And I obviously did it wrong.

Resolves #

How this PR fixes it

Ads the necessary info to the docs about the current process

How to test it

Screenshots

Checklist

• I've tested the branch on mobile 📱
• I've documented how it affects the analytics (if at all) 📊
• I've written a unit/e2e test for it (if applicable) 🧑‍💻

[github-actions]

Branch preview

✅ Deploy successful!

https://update_release_docs--walletweb.review-wallet-web.5afe.dev/home?safe=eth:0xA77DE01e157f9f57C7c4A326eeE9C4874D0598b6

[github-actions]

ESLint Summary View Full Report

Annotations are provided inline on the Files Changed tab. You can also see all annotations that were generated on the annotations page.

Type	Occurrences	Fixable
Errors	0	0
Warnings	0	0
Ignored	0	N/A

• Result: ✅ success
• Annotations: 0 total

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^{Report generated by eslint-plus-action}

[github-actions]

📦 Next.js Bundle Analysis for safe-wallet-web

This analysis was generated by the Next.js Bundle Analysis action. 🤖

This PR introduced no changes to the JavaScript bundle! 🙌

[github-actions]

Coverage report

St.❔	Category	Percentage	Covered / Total
🟡	Statements	78.82%	11285/14317
🔴	Branches	56.64%	2507/4426
🟡	Functions	63.08%	1796/2847
🟢	Lines	80.18%	10178/12694

Test suite run success

1384 tests passing in 186 suites.

Report generated by 🧪jest coverage report action from 6e2eea1