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/event_loop_runtime_test.cc b/aos/events/event_loop_runtime_test.cc
index 7a49fe1..6bd4c70 100644
--- a/aos/events/event_loop_runtime_test.cc
+++ b/aos/events/event_loop_runtime_test.cc
@@ -40,7 +40,7 @@
             builder.CheckOk(builder.Send(ping.Finish()));
           }
         })
-        ->Setup(
+        ->Schedule(
             ping_event_loop->monotonic_now() + std::chrono::milliseconds(10),
             std::chrono::milliseconds(10));
     ASSERT_EQ(starting_count, started_test_count());