fixup! Add the TracingMacros module and the @Traced macro

This didn't need to be `@_exported import`, this change cleans up the
docs

Author: porglezomp

Sources/TracingMacros/TracedMacro.swift

@@ -11,7 +11,7 @@
 // SPDX-License-Identifier: Apache-2.0
 //
 //===----------------------------------------------------------------------===//
-@_exported import ServiceContextModule
+import ServiceContextModule
 import Tracing
 
 /// A span name for a traced operation, either derived from the function name or explicitly specified.