Bug fix

The bottommost node of a finger isn't necessarily the root for an
iterator's version. It could be "end"

include/VersionedMap.h

@@ -152,8 +152,7 @@ struct __attribute__((__visibility__("default"))) VersionedMap {
    * and <= `getVersion()`.
    *
    * Thread-safe as long as a version is not concurrently invalidated by
-   * `setOldestVersion`. There's a performance benefit if you pass iterator[i]
-   * previously obtained at version[i]. */
+   * `setOldestVersion`. */
   void firstGeq(const Key *key, const int64_t *version, Iterator *iterator,
                 int count) const;