DOC: management: document cache_hits and cache_lookups in the CSV format

Counters for cache_hits and cache_lookups were added with commit
a1214a50 ("MINOR: cache: report the number of cache lookups and cache
hits") but not documented in management.txt.

(cherry picked from commit 34ebb5cbab1801b413750ff8eb0025210a6d0123)
Signed-off-by: Willy Tarreau <w@1wt.eu>
1 file changed