update documentation. addresses #202

git-svn-id: file:///svn/tokudb@1926 c7de825b-a66e-492c-adef-691d508d4ae1

newbrt/brt-search.h

@@ -10,8 +10,8 @@ enum {
 struct brt_search;
 
 /* the search compare function should return 0 for all xy < kv and 1 for all xy >= kv 
-   the compare function has liberty in implementing the semantics, but the result should
-   be a ramp */
+   the compare function should be a step function from 0 to 1 for a left to right search
+   and 1 to 0 for a right to left search */
 
 typedef int (*brt_search_compare_func_t)(struct brt_search */*so*/, DBT */*x*/, DBT */*y*/);