fs: remove NTFS classic from docum. index

With the remove of the NTFS classic filesystem, also remove its
documentation entry from the filesystems index to prevent a
kernel-doc warning:

Documentation/filesystems/index.rst:63: WARNING: toctree contains reference to nonexisting document 'filesystems/ntfs'

Fixes: 9c67092 ("fs: Remove NTFS classic")
Signed-off-by: Randy Dunlap <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Cc: Matthew Wilcox (Oracle) <[email protected]>
Cc: Alexander Viro <[email protected]>
Cc: Christian Brauner <[email protected]>
Cc: Jan Kara <[email protected]>
Cc:  <[email protected]>
Cc: Namjae Jeon <[email protected]>
Cc: Dave Chinner <[email protected]>
Cc: Anton Altaparmakov <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Cc:  <[email protected]>
Signed-off-by: Christian Brauner <[email protected]>

Author: rddunlap

Documentation/filesystems/index.rst

@@ -98,7 +98,6 @@ Documentation for filesystem implementations.
    isofs
    nilfs2
    nfs/index
-   ntfs
    ntfs3
    ocfs2
    ocfs2-online-filecheck