docs: move ext4 administrative docs to admin-guide/

Move the ext4 mount option and other administrative stuff to the Linux
administrator's guide.

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

Documentation/admin-guide/ext4.rst

@@ -1,7 +1,7 @@
 .. SPDX-License-Identifier: GPL-2.0
 
 ========================
-General Information
+ext4 General Information
 ========================
 
 Ext4 is an advanced level of the ext3 filesystem which incorporates

Documentation/admin-guide/index.rst

@@ -71,6 +71,7 @@ configure specific aspects of kernel behavior to your liking.
    java
    ras
    bcache
+   ext4
    pm/index
    thunderbolt
    LSM/index

Documentation/conf.py

@@ -383,6 +383,8 @@ latex_documents = [
      'The kernel development community', 'manual'),
     ('filesystems/index', 'filesystems.tex', 'Linux Filesystems API',
      'The kernel development community', 'manual'),
+    ('admin-guide/ext4', 'ext4-admin-guide.tex', 'ext4 Administration Guide',
+     'ext4 Community', 'manual'),
     ('filesystems/ext4/index', 'ext4.tex', 'ext4 Filesystem',
      'ext4 Filesystem Developers', 'manual'),
     ('gpu/index', 'gpu.tex', 'Linux GPU Driver Developer\'s Guide',

Documentation/filesystems/ext4/index.rst

@@ -13,5 +13,4 @@ the ext4 community.
    :maxdepth: 5
    :numbered:
 
-   ext4
    ondisk/index