fix waitForRebuild() comment

Author: Vladimir Kotal

opengrok-web/src/main/java/org/opengrok/web/api/v1/suggester/provider/service/SuggesterService.java

@@ -63,7 +63,7 @@ public interface SuggesterService {
     void rebuild(String project);
 
     /**
-     * Wait for the initial rebuild. For testing.
+     * Wait for rebuild. For testing.
      * @param timeout timeout to wait for
      * @param unit timeout unit
      */