btrfs: add details to error messages at btrfs_delete_delayed_dir_index()

btrfs: add details to error messages at btrfs_delete_delayed_dir_index()

Update the error messages with:

1) Fix typo in the first one, deltiona -> deletion;

2) Remove redundant part of the first message, the part following the
   comma, and including all the useful information: root, inode, index
   and error value;

3) Update the second message to use more formal language (example 'error'
   instead of 'err'), , remove redundant part about "deletion tree of
   delayed node..." and print the relevant information in the same
   format and order as the first message, without the ugly opening
   parenthesis without a space separating from the previous word.
   This also makes the message similar in format to the one we have at
   btrfs_insert_delayed_dir_index().

Reviewed-by: Boris Burkov <boris@bur.io>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>