vfs cache: fix vfs.cache.stats.* name typos
Two vfs.cache.stats names are fixed:
- s/.dotdothis/.dotdothits/
- s/.posszaps/.poszaps/
Signed-off-by: Igor Ostapenko <pm@igoro.pro>
[mjg: massaged the header a little bit]
(cherry picked from commit 0e0c47ecd624da976bf7e1ff391cb4a00c76b200)