7124: add documentation for the new launch modes

[Don-Vito]

This PR documents new launch mode values introduced in microsoft/terminal#7873 to address microsoft/terminal#7124.

Not sure what is the correct contribution procedure for such changes. Hence, opening this change as a draft PR to master (please do not merge 😄 )

[opbld30]

Docs Build status updates of commit 32803a0:

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TerminalDocs/customize-settings/global-settings.md	✅Succeeded	View

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[opbld33]

Docs Build status updates of commit 049a1f4:

✅ Validation status: passed

File	Status	Preview URL	Details
TerminalDocs/command-line-arguments.md	✅Succeeded	View
TerminalDocs/customize-settings/global-settings.md	✅Succeeded	View

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[opbld33]

Docs Build status updates of commit c227da4:

✅ Validation status: passed

File	Status	Preview URL	Details
TerminalDocs/command-line-arguments.md	✅Succeeded	View
TerminalDocs/customize-settings/global-settings.md	✅Succeeded	View

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[zadjii-msft]

I'm gonna block this only until the 1.5 release branch is created, so we can make sure to re-target this to the correct branch.

Also, you should add notes to make it clear which version these properties were added in.

Otherwise, great work here!

[opbld32]

Docs Build status updates of commit 7a10c7b:

✅ Validation status: passed

File	Status	Preview URL	Details
TerminalDocs/command-line-arguments.md	✅Succeeded	View
TerminalDocs/customize-settings/global-settings.md	✅Succeeded	View

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[cinnamon-msft]

I created the release-1.5 branch and have pointed this PR towards that one.