Change firstGeq to compare to param1

include/VersionedMap.h

@@ -150,11 +150,9 @@ struct __attribute__((__visibility__("default"))) VersionedMap {
     Impl *impl = nullptr;
   };
 
-  /** Perform `count` "first greater than or equal to" queries. If there's a
-   * mutation intersecting `key[i]` at `version[i]` then `iterator[i]` will
-   * point to that mutation. Otherwise it points to the first mutation greater
-   * or `end()` if none exists.  `version[i]` must be >= `getOldestVersion()`
-   * and <= `getVersion()`.
+  /** Perform `count` "first greater than or equal to" queries, comparing to
+   * mutations' `param1`. `version[i]` must be >= `getOldestVersion()` 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]