Fix phrasing in calibrate_the_robot service API docs

stretch_core/README.md

@@ -30,7 +30,7 @@ Since a battery is always present on a Stretch system, we instead misuse the `pr
 
 ##### /calibrate_the_robot ([std_srvs/Trigger](https://docs.ros.org/en/noetic/api/std_srvs/html/srv/Trigger.html))
 
-This service will start Stretch's homing procedure, where every joint's zero is found. Robots with relative encoders (vs absolute encoders) need a homing procedure when they power on. For Stretch, it's a one-time 30-second procedure that must occur everytime the robot wakes up before you may send motion commands to or read correct joint positions from Stretch's prismatic and multiturn revolute joints. When this service is triggered, the [mode topic](#mode-std_msgsstring) will reflect that the robot is in "calibration" mode, and after the homing procedure is complete, will switch back to whatever mode the robot was in before this service was triggered. While stretch_driver is in "calibration" mode, no commands to the [cmd_vel topic](#TODO) or the [follow joint trajectory action service](#TODO) will be accepted.
+This service will start Stretch's homing procedure, where every joint's zero is found. Robots with relative encoders (vs absolute encoders) need a homing procedure when they power on. For Stretch, it's a 30-second procedure that must occur everytime the robot wakes up before you may send motion commands to or read correct joint positions from Stretch's prismatic and multiturn revolute joints. When this service is triggered, the [mode topic](#mode-std_msgsstring) will reflect that the robot is in "calibration" mode, and after the homing procedure is complete, will switch back to whatever mode the robot was in before this service was triggered. While stretch_driver is in "calibration" mode, no commands to the [cmd_vel topic](#TODO) or the [follow joint trajectory action service](#TODO) will be accepted.
 
 Other ways to home the robot include using the `stretch_robot_home.py` CLI tool from a terminal, or calling [`robot.home()`](https://docs.hello-robot.com/0.2/stretch-tutorials/stretch_body/tutorial_stretch_body_api/#stretch_body.robot.Robot.home) from Stretch's Python API.