Documentation: ext4: Move inode table short docs into its own file

The short description of inode table is in bitmaps.rst alongside the
proper bitmpas documentation. The docs file is short enough that it fits
whole browser screen on desktop, which implies that when readers click
"Inode Table", they will essentially see bitmaps docs.

Move inode table short description.

Signed-off-by: Bagas Sanjaya <bagasdotme@gmail.com>
Acked-by: Theodore Ts'o <tytso@mit.edu>
Acked-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20250620105643.25141-7-bagasdotme@gmail.com

Documentation/filesystems/ext4/bitmaps.rst

@@ -19,10 +19,3 @@ necessarily the case that no blocks are in use -- if ``meta_bg`` is set,
 the bitmaps and group descriptor live inside the group. Unfortunately,
 ext2fs_test_block_bitmap2() will return '0' for those locations,
 which produces confusing debugfs output.
-
-Inode Table
------------
-Inode tables are statically allocated at mkfs time.  Each block group
-descriptor points to the start of the table, and the superblock records
-the number of inodes per group.  See the section on inodes for more
-information.

Documentation/filesystems/ext4/globals.rst

@@ -11,6 +11,7 @@ have static metadata at fixed locations.
    super
    group_descr
    bitmaps
+   inode_table
    mmp
    journal
    orphan

Documentation/filesystems/ext4/inode_table.rst

@@ -0,0 +1,9 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+Inode Table
+-----------
+
+Inode tables are statically allocated at mkfs time.  Each block group
+descriptor points to the start of the table, and the superblock records
+the number of inodes per group.  See :doc:`inode documentation <inodes>`
+for more information on inode table layout.