Fix dumb typo in 08556257 (#6844)

weed/storage/needle_map/compact_map.go

@@ -3,7 +3,7 @@ package needle_map
 /* CompactMap is an in-memory map of needle indeces, optimized for memory usage.
  *
  * It's implemented as a map of sorted indeces segments, which are in turn accessed through binary
- * search. This guarantees a best-case scenario (ordered inserts/updates) of O(N) and a worst case
+ * search. This guarantees a best-case scenario (ordered inserts/updates) of O(1) and a worst case
  * scenario of O(log n) runtime, with memory usage unaffected by insert ordering.
  *
  * Note that even at O(log n), the clock time for both reads and writes is very low, so CompactMap