docs: filesystems: vfs: Fix pre-amble indentation

Currently file pre-amble contains custom indentation.  RST is not going
to like this, lets left-align the text.  Put the copyright notices in a
list in preparation for converting document to RST.

Tested-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Tobin C. Harding <tobin@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/filesystems/vfs.txt

@@ -6,8 +6,8 @@ Overview of the Linux Virtual File System
 
 Original author: Richard Gooch <rgooch@atnf.csiro.au>
 
-  Copyright (C) 1999 Richard Gooch
-  Copyright (C) 2005 Pekka Enberg
+- Copyright (C) 1999 Richard Gooch
+- Copyright (C) 2005 Pekka Enberg
 
 
 Introduction