[wpilib] Use misspell to find more spelling errors (NFC) (#2679)

wpilibc/src/main/native/include/frc/DriverStation.h

@@ -368,7 +368,7 @@ class DriverStation : public ErrorBase {
    * Warning: This is not an official time (so it cannot be used to dispute ref
    * calls or guarantee that a function will trigger before the match ends).
    *
-   * The Practice Match function of the DS approximates the behaviour seen on
+   * The Practice Match function of the DS approximates the behavior seen on
    * the field.
    *
    * @return Time remaining in current match period (auto or teleop)

wpilibc/src/main/native/include/frc/IterativeRobot.h

@@ -36,7 +36,7 @@ class IterativeRobot : public IterativeRobotBase {
   /**
    * Provide an alternate "main loop" via StartCompetition().
    *
-   * This specific StartCompetition() implements "main loop" behaviour synced
+   * This specific StartCompetition() implements "main loop" behavior synced
    * with the DS packets.
    */
   void StartCompetition() override;