Remove rowsToScroll from the global settings section

[DHowett]

Pursuant to microsoft/terminal#6891.

[DHowett]

@cinnamon-msft how do we handle the removal of settings? This one is very much "I'm just dropping it from the docs", but maybe we need to add an "Until 1.2" badge?

[opbld31]

Docs Build status updates of commit cbb3881:

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

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[cinnamon-msft]

Maybe "Deprecated in 1.2" and leave it for a bit?

[opbld31]

Docs Build status updates of commit 4f70e13:

✅ Validation status: passed

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

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[opbld32]

Docs Build status updates of commit 7d93e6a:

✅ Validation status: passed

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

For more details, please refer to the build report.

Note: Broken links written as relative paths are included in the above build report. For broken links written as absolute paths or external URLs, see the broken link report.

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