ext4: update on-disk format documentation for fs-verity

Document the format of verity files on ext4, and the corresponding inode
and superblock flags.

Reviewed-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Eric Biggers <ebiggers@google.com>

Documentation/filesystems/ext4/inodes.rst

@@ -277,6 +277,8 @@ The ``i_flags`` field is a combination of these values:
      - This is a huge file (EXT4\_HUGE\_FILE\_FL).
    * - 0x80000
      - Inode uses extents (EXT4\_EXTENTS\_FL).
+   * - 0x100000
+     - Verity protected file (EXT4\_VERITY\_FL).
    * - 0x200000
      - Inode stores a large extended attribute value in its data blocks
        (EXT4\_EA\_INODE\_FL).
@@ -299,9 +301,9 @@ The ``i_flags`` field is a combination of these values:
      - Reserved for ext4 library (EXT4\_RESERVED\_FL).
    * -
      - Aggregate flags:
-   * - 0x4BDFFF
+   * - 0x705BDFFF
      - User-visible flags.
-   * - 0x4B80FF
+   * - 0x604BC0FF
      - User-modifiable flags. Note that while EXT4\_JOURNAL\_DATA\_FL and
        EXT4\_EXTENTS\_FL can be set with setattr, they are not in the kernel's
        EXT4\_FL\_USER\_MODIFIABLE mask, since it needs to handle the setting of