Update nf-fltkernel-fltcreatesectionfordatascan.md

[zefklop]

Hello,

I'm creating this pull request to clear up a potential confusion about the context where FltCreateSectionForDataScan can be called.
This is referring to that part of the FsRtlCreateSectionForDataScan documentation, in the remarks section:

Important The FsRtlCreateSectionForDataScan routine should only be used in cases where a handle to the file object specified in the FileObject parameter has not yet been created (typically while processing a post-create operation). If the driver has a handle to the file object or can obtain a handle to the file object, the driver should use the ZwCreateSection routine instead.

You may consider this PR as an ask to clear up that point: is it safe to call this API on a file object with FO_HANDLE_CREATED and without FO_CLEANUP_COMPLETE set? The documented limitation of FsRtlCreateSectionForDataScan dates from Windows 7 and this API was introduced in Windows 8. Also, does this limitation still exist for FsRtlCreateSectionForDataScan ?

Thanks a lot