ext4: import inodes chapter from wiki page

Import the chapter about inodes from the on-disk format wiki
page into the kernel documentation.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

Documentation/filesystems/ext4/ondisk/dynamic.rst

+.. SPDX-License-Identifier: GPL-2.0
+
+Dynamic Structures
+==================
+
+Dynamic metadata are created on the fly when files and blocks are
+allocated to files.
+
+.. include:: inodes.rst

Documentation/filesystems/ext4/ondisk/index.rst

@@ -6,3 +6,4 @@ Data Structures and Algorithms
 .. include:: about.rst
 .. include:: overview.rst
 .. include:: globals.rst
+.. include:: dynamic.rst