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/aos/events/shm_event_loop.cc b/aos/events/shm_event_loop.cc
index 3e1be99..09cd488 100644
--- a/aos/events/shm_event_loop.cc
+++ b/aos/events/shm_event_loop.cc
@@ -588,8 +588,8 @@
     disabled_ = false;
     const auto monotonic_now = Call(monotonic_clock::now, base_);
     if (event_.valid()) {
-      // If someone called Setup inside Call, rescheduling is already taken care
-      // of.  Bail.
+      // If someone called Schedule inside Call, rescheduling is already taken
+      // care of. Bail.
       return;
     }
     if (disabled_) {
@@ -618,8 +618,8 @@
     }
   }
 
-  void Setup(monotonic_clock::time_point base,
-             monotonic_clock::duration repeat_offset) override {
+  void Schedule(monotonic_clock::time_point base,
+                monotonic_clock::duration repeat_offset) override {
     shm_event_loop_->CheckCurrentThread();
     if (event_.valid()) {
       shm_event_loop_->RemoveEvent(&event_);