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/y2023/wpilib_interface.cc b/y2023/wpilib_interface.cc
index cc911ab..978d6e5 100644
--- a/y2023/wpilib_interface.cc
+++ b/y2023/wpilib_interface.cc
@@ -297,7 +297,8 @@
     timer_handler_->set_name("CANSensorReader Loop");
 
     event_loop->OnRun([this]() {
-      timer_handler_->Setup(event_loop_->monotonic_now(), 1 / kCANUpdateFreqHz);
+      timer_handler_->Schedule(event_loop_->monotonic_now(),
+                               1 / kCANUpdateFreqHz);
     });
   }
 
@@ -987,7 +988,7 @@
     AddLoop(&sensor_reader_event_loop);
 
     // Thread 5.
-    // Setup CAN.
+    // Set up CAN.
     if (!FLAGS_ctre_diag_server) {
       c_Phoenix_Diagnostics_SetSecondsToStart(-1);
       c_Phoenix_Diagnostics_Dispose();
@@ -1022,7 +1023,7 @@
     AddLoop(&can_output_event_loop);
 
     // Thread 6
-    // Setup superstructure output
+    // Set up superstructure output.
     ::aos::ShmEventLoop output_event_loop(&config.message());
     output_event_loop.set_name("PWMOutputWriter");
     SuperstructureWriter superstructure_writer(&output_event_loop);
@@ -1039,7 +1040,7 @@
     AddLoop(&output_event_loop);
 
     // Thread 7
-    // Setup led_indicator
+    // Set up led_indicator.
     ::aos::ShmEventLoop led_indicator_event_loop(&config.message());
     led_indicator_event_loop.set_name("LedIndicator");
     control_loops::superstructure::LedIndicator led_indicator(