Fix documentation

source/examples/HotReloadDemo/PluginV1/src/CppWidget.cpp

@@ -1,6 +1,9 @@
-/* CppWidget V1 -- "before your edit". See PluginV2/src/CppWidget.cpp
+/**
+ * @file CppWidget.cpp
+ * @brief CppWidget V1 -- "before your edit". See PluginV2/src/CppWidget.cpp
  * for "after": same three exports change behavior together, exactly
- * like PluginV1/src/Plugin.cpp's plain-C functions do.
+ * like PluginV1/src/Plugin.cpp's plain-C functions do. Every member
+ * defined here is documented in ../Shared/CppWidgetApi.h.
  */
 #include "CppWidgetApi.h"
 

source/examples/HotReloadDemo/PluginV1/src/Plugin.cpp

@@ -1,8 +1,11 @@
-/* PluginV1 -- "before your edit". See PluginV2/src/Plugin.cpp for
+/**
+ * @file Plugin.cpp
+ * @brief PluginV1 -- "before your edit". See PluginV2/src/Plugin.cpp for
  * "after"; the two deliberately export the identical set of names
  * (minus plugin_legacy_feature, removed in V2) so HotReloadContext can
  * line them up. See ../Shared/PluginApi.h for what each export is
- * there to demonstrate.
+ * there to demonstrate (and for the documentation of every function
+ * defined here).
  */
 #include "PluginApi.h"
 
@@ -22,9 +25,8 @@ int plugin_legacy_feature(int input)
 }
 
 #if defined(__GNUC__) || defined(__clang__)
-int plugin_tiny_function(int input)
+void plugin_tiny_function(void)
 {
-	return input + 1;
 }
 #endif