Add details to 'about_Modules' topic

[guillermooo]

PR Summary

Reorganize paragraphs and try to provide details why modules can help.

PR Checklist

• Descriptive Title: This PR's title is a synopsis of the changes it proposes.
• Summary: This PR's summary describes the scope and intent of the change.
• Contributor's Guide: I have read the contributors guide.
• Style: This PR adheres to the style guide.

[guillermooo]

@michaeltlombardi Before updating the other files, please check if this looks OK to you.

[learn-build-service-prod]

Learn Build status updates of commit 4af23e8:

✅ Validation status: passed

File	Status	Preview URL	Details
reference/5.1/Microsoft.PowerShell.Core/About/about_Modules.md	✅Succeeded	View (powershell-5.1)

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
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[github-actions]

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[michaeltlombardi]

@guillermooo - I'm sorry for the late reply to your PR, it looks like my prior review didn't submit correctly.

What you have here looks good, I like the restructuring and clarifications. I have a few minor recommendations, but nothing major. I think you can continue this work and I'll make sure to review it promptly.

One thing to keep in mind is that we need to limit the line length in about topics to 80 characters or fewer (see the markdownlint config). You can use the Reflow Markdown VS Code extension to make that task easier. I see that our contributor guide doesn't point this out, so I'll update that shortly.

[learn-build-service-prod]

Learn Build status updates of commit f1f0f8d:

✅ Validation status: passed

File	Status	Preview URL	Details
reference/5.1/Microsoft.PowerShell.Core/About/about_Modules.md	✅Succeeded	View (powershell-5.1)

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel

[learn-build-service-prod]

Learn Build status updates of commit 24f6253:

✅ Validation status: passed

File	Status	Preview URL	Details
reference/5.1/Microsoft.PowerShell.Core/About/about_Modules.md	✅Succeeded	View (powershell-5.1)
reference/7.2/Microsoft.PowerShell.Core/About/about_Modules.md	✅Succeeded	View (powershell-7.2)
reference/7.4/Microsoft.PowerShell.Core/About/about_Modules.md	✅Succeeded	View (powershell-7.4)
reference/7.5/Microsoft.PowerShell.Core/About/about_Modules.md	✅Succeeded	View (powershell-7.5)

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel