message: Fix image extension case
diff: @@ -51,7 +51,7 @@ Ramps a velocity command from the current value to the target value.
  ## INPUT_MODE_POS_FILTER
  Implements a 2nd order position tracking filter. Inteded for use with step/dir interface, but can also be used with position-only commands.
  -![POS Filter Response](secondOrderResponse.png)
  +![POS Filter Response](secondOrderResponse.PNG)
  Result of a step command from 1000 to 0
  ### Configuration Values:
  @@ -71,7 +71,7 @@ Not Implemented.
  ## INPUT_MODE_TRAP_TRAJ
  Implementes an online trapezoidal trajectory planner.
  -![Trapezoidal Planner Response](TrapTrajPosVel.png)
  +![Trapezoidal Planner Response](TrapTrajPosVel.PNG)
  ### Configuration Values:
  * `<axis>.trap_traj.config.vel_limit`
  