how-tos made with markdown snippet injector

apps/tests/trace.md

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+---
+nav-title: "trace How-To"
+title: "How-To"
+description: "Examples for using trace"
+---
+# Trace
+Tracing information about your app requires the "trace" module.
+<snippet id='trace-require'/>
+
+### Tracing all categories of events.
+<snippet id='trace-all-categories'/>
+
+### Tracing specific categories of events.
+<snippet id='trace-specific-categories'/>
+
+### Write your own trace message.
+<snippet id='trace-message'/>