Add examples for + and minus, fix unary -

[yecril71pl]

PR Summary

Fix: the result of unary operator - is not always negative.
About unary operator +.
Addition and subtraction of enumerated values.
Minor editing corrections.

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[opbld32]

Docs Build status updates of commit 1262780:

✅ Validation status: passed

File	Status	Preview URL	Details
reference/7.1/Microsoft.PowerShell.Core/About/about_Arithmetic_Operators.md	✅Succeeded	View (powershell-7.1)

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[sdwheeler]

@yecril71pl Are you going to make the same changes to the other versions?

[yecril71pl]

@yecril71pl Are you going to make the same changes to the other versions?

Sure, as soon as you tell me they are OK.

[sdwheeler]

Go ahead and copy the changes to all versions.

[opbld30]

Docs Build status updates of commit ac61b42:

✅ Validation status: passed

File	Status	Preview URL	Details
reference/7.1/Microsoft.PowerShell.Core/About/about_Arithmetic_Operators.md	✅Succeeded	View (powershell-7.1)

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[opbld30]

Docs Build status updates of commit cd3fede:

✅ Validation status: passed

File	Status	Preview URL	Details
reference/7.1/Microsoft.PowerShell.Core/About/about_Arithmetic_Operators.md	✅Succeeded	View (powershell-7.1)
reference/7.2/Microsoft.PowerShell.Core/About/about_Arithmetic_Operators.md	✅Succeeded	View (powershell-7.2)

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[opbld32]

Docs Build status updates of commit a98bbc2:

✅ Validation status: passed

File	Status	Preview URL	Details
reference/7.0/Microsoft.PowerShell.Core/About/about_Arithmetic_Operators.md	✅Succeeded	View (powershell-7)
reference/7.1/Microsoft.PowerShell.Core/About/about_Arithmetic_Operators.md	✅Succeeded	View (powershell-7.1)
reference/7.2/Microsoft.PowerShell.Core/About/about_Arithmetic_Operators.md	✅Succeeded	View (powershell-7.2)

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[opbld33]

Docs Build status updates of commit 09f310a:

✅ Validation status: passed

File	Status	Preview URL	Details
reference/5.1/Microsoft.PowerShell.Core/About/about_Arithmetic_Operators.md	✅Succeeded	View (powershell-5.1)
reference/7.0/Microsoft.PowerShell.Core/About/about_Arithmetic_Operators.md	✅Succeeded	View (powershell-7)
reference/7.1/Microsoft.PowerShell.Core/About/about_Arithmetic_Operators.md	✅Succeeded	View (powershell-7.1)
reference/7.2/Microsoft.PowerShell.Core/About/about_Arithmetic_Operators.md	✅Succeeded	View (powershell-7.2)

For more details, please refer to the build report.

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[opbld32]

Docs Build status updates of commit 0c65b5d:

✅ Validation status: passed

File	Status	Preview URL	Details
reference/5.1/Microsoft.PowerShell.Core/About/about_Arithmetic_Operators.md	✅Succeeded	View (powershell-5.1)
reference/7.0/Microsoft.PowerShell.Core/About/about_Arithmetic_Operators.md	✅Succeeded	View (powershell-7)
reference/7.1/Microsoft.PowerShell.Core/About/about_Arithmetic_Operators.md	✅Succeeded	View (powershell-7.1)
reference/7.2/Microsoft.PowerShell.Core/About/about_Arithmetic_Operators.md	✅Succeeded	View (powershell-7.2)

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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