lpm6: fix comments spelling
lpm6: fix comments spelling

Fix spelling errors in comments.

Fixes: e480688dce6d ("lpm6: add incremental update on delete")
Cc: stable@dpdk.org

Signed-off-by: Stephen Hemminger <06fa905d7f2aaced6dc72e9511c71a2a51e8aead@networkplumber.org>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk