Update virtual-directories.md

[JoshuaSWelsh]

Updated spelling and grammar.

[opbld33]

Docs Build status updates of commit 368236e:

❌ Validation status: errors

Please follow instructions here which may help to resolve issue.

File	Status	Preview URL	Details
IIS-Administration/api/iis.administration.swagger.json	❌Error		Details

IIS-Administration/api/iis.administration.swagger.json

• Line 1, Column 1: [Error-schema-not-found] Unknown schema ''.

For more details, please refer to the build report.

If you see build warnings/errors with permission issues, it might be due to single sign-on (SSO) enabled on Microsoft's GitHub organizations. Please follow instructions here to re-authorize your GitHub account to Docs Build.

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.

Note: Your PR may contain errors or warnings unrelated to the files you changed. This happens when external dependencies like GitHub alias, Microsoft alias, cross repo links are updated. Please use these instructions to resolve them.

For any questions, please:

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