ext4: move ext4.txt into its own directory

Move Documentation/filesystems/ext4.txt into
Documentation/filesystems/ext4/ext4.rst in preparation for adding more
ext4 documentation.

Note that the documentation isn't in rst format yet, but as it's not
linked from anywhere it won't cause build errors.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

1 files changed, 0 insertions, 0 deletions

diff --git a/Documentation/filesystems/ext4.txt b/Documentation/filesystems/ext4/ext4.rst
index 7f628b9f7c4b..7f628b9f7c4b 100644
--- a/Documentation/filesystems/ext4.txt
+++ b/Documentation/filesystems/ext4/ext4.rst