SFI images IIS-docs sev1-2 updates only

[wadepickett]

Contributes to dotnet/AspNetCore.Docs#33750

All SFI image updates to fix sev 1-2 issues per SFI issue instruction.

There are also around 18 images (of the 61 total) that had SFI sev 1-2 issues that were orphaned, with no content referring to them that will be deleted, but those will be in a sperate PR.