Rename timer `Setup` function to `Schedule`

This patch was motivated by my desire to fix a typo in the function
name. The noun "setup" is 1 word. The verb "set up" is 2 words. All
other member functions are verbs, so this one should be a verb too.
That means that the function should be called `SetUp`. During the
discussion that resulted from the rename, James Kuszmaul pointed out
that "setting up" a timer can be confusing. It implies that you can
only "set up" a timer once. But the intent is to let users set up
timers as many times as they like. So we decided on renaming the
function to `Schedule`. That conveys the purpose and intent better.

I took this opportunity to fix some other typos involving the verb
"set up".

Signed-off-by: Philipp Schrader <philipp.schrader@gmail.com>
Change-Id: I2f557d1f946960af82711f248820d5e2d385a5d3
diff --git a/y2022/vision/gpio.h b/y2022/vision/gpio.h
index bc9aa8a..6ed7328 100644
--- a/y2022/vision/gpio.h
+++ b/y2022/vision/gpio.h
@@ -332,13 +332,13 @@
           // If the leds are currently off, turn them on for duty_cycle % of
           // period If they are currently on, turn them off for 1 -
           // duty_cycle % of period
-          pwm_timer_->Setup(
+          pwm_timer_->Schedule(
               event_loop_->monotonic_now() +
               std::chrono::microseconds(leds_on_ ? (period_us - on_time_us)
                                                  : on_time_us));
           leds_on_ = !leds_on_;
         })) {
-    pwm_timer_->Setup(event_loop_->monotonic_now());
+    pwm_timer_->Schedule(event_loop_->monotonic_now());
   };
 
   void set_duty_cycle(double duty_cycle) { duty_cycle_ = duty_cycle; }