Document ExpandSelectionToWord action

[carlos-zamora]

Document expandSelectionToWord action introduced in https://github.com/microsoft/terminal/pull/13765

[opbld32]

Docs Build status updates of commit cce2b2f:

:white_check_mark: Validation status: passed

File	Status	Preview URL	Details
TerminalDocs/customize-settings/actions.md	:white_check_mark: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.

For any questions, please:

• Try searching the docs.microsoft.com contributor guides
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[opbld32]

Docs Build status updates of commit cce2b2f:

:white_check_mark: Validation status: passed

File	Status	Preview URL	Details
TerminalDocs/customize-settings/actions.md	:white_check_mark: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.

For any questions, please:

• Try searching the docs.microsoft.com contributor guides
• Post your question in the Docs support channel