message: Update legacy-protocol.md
diff: @@ -52,7 +52,7 @@ s type index value
  ** `0` is float
  ** `1` is int
  ** `2` is bool
  -* `index` is the index in the corresponding [exposed variable table](MotorControl/commands.c).
  +* `index` is the index in the corresponding [exposed variable table](MotorControl/legacy_commands.c).
  For example
  * `g 0 12` will return the phase resistance of M0
  