LUDOC-11 setup: update limits for new releases

LUDOC-11 setup: update limits for new releases

Update the filesystem limits based on recent changes.
- directory size limits for ldiskfs increase due to large_dir
- maximum OST size limits increase due to recent fixes
- reference ARM for large pages instead of ancient IA64

Add/improve related cross-reference label names, which improves
the visible URL names in the HTML version of the manual.

Signed-off-by: Andreas Dilger <adilger@dilger.ca>
Change-Id: I793b1a8a657bc3470f17c983a98404dcaf3ebbe5
Reviewed-on: https://review.whamcloud.com/39208
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>