Correct grammatical errors

README.md

@@ -58,7 +58,7 @@ LAVN
          |--traj_480p_scene00
             |--rgb_00001.jpg
 ```
-where the main landmark annotation scripts ```makeData_virtual.py``` and ```makeData_real.py``` are in folder (1) ```src```. (2) ```Virtual``` and (3) ```Real``` stores trajectories collected in the simulation and real world, respectively. In each trajectory's data is collected in the following format:
+where the main landmark annotation scripts ```makeData_virtual.py``` and ```makeData_real.py``` are in folder (1) ```src```. (2) ```Virtual``` and (3) ```Real``` store trajectories collected in the simulation and real world, respectively. Each trajectory's data is collected in the following format:
 ```
          |--traj_<SCENE_ID>
             |--worker_graph.json