Improve wording for -UseBasicParsing

[jawn]

Affect and effect are similar, but not the same. I think effect is the word that is intended here.
https://www.merriam-webster.com/dictionary/affect

Version(s) of document impacted

• [Don't know ] Impacts 6.1 document
• Impacts 6.0 document
• Impacts 5.1 document
• Impacts 5.0 document
• Impacts 4.0 document
• Impacts 3.0 document

Reason(s) for not updating all version of documents

• [ X] The documented feature was introduced in version (6.0 - made this option obsolete) of PowerShell
• This issue only shows up in version (list version(s) here) of the document
• This PR partially fixes the issue, and issue # tracks the remaining work

[zjalexander]

✅ Validation status: passed

File	Status	Preview URL	Details
reference/6/Microsoft.PowerShell.Utility/Invoke-WebRequest.md	✅Succeeded

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