Fix typos in about_Comment_Based_Help.md

[sethvs]

Version(s) of document impacted

• Impacts 6.1 document
• Impacts 6.0 document
• Impacts 5.1 document
• Impacts 5.0 document
• Impacts 4.0 document
• Impacts 3.0 document

[zjalexander]

✅ Validation status: passed

File	Status	Preview URL	Details
reference/3.0/Microsoft.PowerShell.Core/About/about_Comment_Based_Help.md	✅Succeeded
reference/4.0/Microsoft.PowerShell.Core/About/about_Comment_Based_Help.md	✅Succeeded
reference/5.0/Microsoft.PowerShell.Core/About/about_Comment_Based_Help.md	✅Succeeded
reference/5.1/Microsoft.PowerShell.Core/About/about_Comment_Based_Help.md	✅Succeeded
reference/6/Microsoft.PowerShell.Core/About/about_Comment_Based_Help.md	✅Succeeded

For more details, please refer to the build report.

Note: If you changed an existing file name or deleted a file, broken links in other files to the deleted or renamed file are listed only in the full build report.