Update Visual Studio subscription information

[atdhemusliu]

This commit corrects a typo and rephrases instructions for linking Microsoft 365 developer subscriptions with Visual Studio subscriptions.

[learn-build-service-prod]

Learn Build status updates of commit 88bf109:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/join-with-visual-studio.md	✅Succeeded	View

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 ab20927:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/join-with-visual-studio.md	✅Succeeded	View

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