Fixed variable name and typos in the examples

[E-Saggese]

Made the variable name the same between the two lines of the example, would not work otherwise, and also fixed the file name that had a typo.

[opbld32]

Docs Build status updates of commit 8737344:

❌ Validation status: errors

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[opbld31]

Docs Build status updates of commit 3197ffb:

✅ Validation status: passed

File	Status	Preview URL	Details
exchange/exchange-ps/exchange/Test-TextExtraction.md	✅Succeeded	View (exchange-ps)

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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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