Update SharePoint policies 1.3 with less verbose language

[mitchelbaker-cisa]

🐛 Summary

MS.SHAREPOINT.1.3v1 and MS.SHAREPOINT.1.4v1 contains the following note:

• Note: This policy is only applicable if the external sharing slider on the admin page is set to any value other than Only People in your organization.

"is set to any value other than" is verbose language and makes the policy instructions confusing.

The note should be updated with a negation to be more clear:

• Note: This policy is only applicable if the external sharing slider on the admin page is not set to Only People in your organization.

Expected behavior

1. Update policy with clear language
2. Update the NAString() method and all instances where its used to reflect the updated language.

[mitchelbaker-cisa]

#1309 made the code changes for this issue, SharePoint 1.3 details now displays:

This policy is only applicable if the external sharing slider on the admin page is not set to Only People In Your Organization. See Secure Configuration Baseline policy for more info

Now this issue only requires the baseline change to be made.