design: document the large extent count ondisk format changes

Update the ondisk format documentation to discuss the larger maximum
extent counts that were added in 2022.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Chandan Babu R <chandan.babu@oracle.com>
2 files changed
tree: 1f21abb97cc21c241b0eaa7a710f8e4b86fb84b7
  1. admin/
  2. design/
  3. .gitignore
  4. CHANGES
  5. COPYING
  6. Makefile
  7. README