[wpilib] Remove unhelpful comments from BooleanEvent (#7970)

These were apparently a meme about state being hard to manage rather
than a statement about the code itself. I spent a while trying to find
some complex logic this comment was alluding to that would indicate why
it's "a nightmare to manage".

wpilibj/src/main/java/edu/wpi/first/wpilibj/event/BooleanEvent.java

@@ -28,7 +28,7 @@ public class BooleanEvent implements BooleanSupplier {
 
   private final BooleanSupplier m_signal;
 
-  /** The state of the condition in the current loop poll. Nightmare to manage. */
+  /** The state of the condition in the current loop poll. */
   private final AtomicBoolean m_state = new AtomicBoolean(false);
 
   /**