document trace_sampler_config.h

Author: dgoffredo

src/datadog/trace_sampler_config.h

@@ -1,5 +1,12 @@
 #pragma once
 
+// This component provides a `struct`, `TraceSamplerConfig`, used to configure
+// `TraceSampler`. `TraceSampler` accepts a `FinalizedTraceSamplerConfig`, which
+// must be obtained from a call to `finalize_config`.
+//
+// `TraceSamplerConfig` is specified as the `trace_sampler` property of
+// `TracerConfig`.
+
 #include <iosfwd>
 #include <optional>
 #include <vector>