Remove HMI info from modules/tools/README.

modules/tools/README.md

 # Tools
 
-## HMI
-  Control panel of Apollo to start/stop modules and drive modes.
-
 ## Diagnostics
-  Display input/output protobuf messages for modules. 
+  Display input/output protobuf messages for modules.
 
 ## Plot_control
-  Subscribe control command message and plot recent x steering, throttle, 
+  Subscribe control command message and plot recent x steering, throttle,
   and brake values.
-  
+
 ## Realtime_plot
   Subscribe planning & control messages and plot real time trajectory, speed,
-  curvature/ST-graph, and acceleration/heading. 
-  
+  curvature/ST-graph, and acceleration/heading.
+
 ## Record_play
 ### Rtk_recorder
-  Record vehicle trajectory and save it into a file. 
+  Record vehicle trajectory and save it into a file.
 
 ### Rtk_player
   Read recorded trajectory and publish it as a planning trajectory.
-