[wpilib] Use misspell to fix spelling errors (NFC) (#2674)

Author: sciencewhiz

include/frc2/command/StartEndCommand.h

@@ -17,7 +17,7 @@
 
 namespace frc2 {
 /**
- * A command that runs a given runnable when it is initalized, and another
+ * A command that runs a given runnable when it is initialized, and another
  * runnable when it ends. Useful for running and then stopping a motor, or
  * extending and then retracting a solenoid. Has no end condition as-is; either
  * subclass it or use Command.WithTimeout() or Command.WithInterrupt() to give