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/network/www/demo_plot.ts b/aos/network/www/demo_plot.ts
index b586411..19bb4a5 100644
--- a/aos/network/www/demo_plot.ts
+++ b/aos/network/www/demo_plot.ts
@@ -33,7 +33,7 @@
   const aosPlotter = new AosPlotter(conn);
 
   {
-    // Setup a plot that shows some arbitrary PDP current values.
+    // Set up a plot that shows some arbitrary PDP current values.
     const pdpValues =
         aosPlotter.addMessageSource('/aos', 'frc971.PDPValues');
     const timingPlot = aosPlotter.addPlot(parentDiv);
@@ -55,7 +55,7 @@
   {
     const timingReport =
         aosPlotter.addMessageSource('/aos', 'aos.timing.Report');
-    // Setup a plot that just shows some arbitrary timing data.
+    // Set up a plot that just shows some arbitrary timing data.
     const timingPlot = aosPlotter.addPlot(parentDiv);
     timingPlot.plot.getAxisLabels().setTitle('Timing Report Wakeups');
     timingPlot.plot.getAxisLabels().setYLabel('PID');