Fix typos in plugin-features.h
#include "private/macros.h"
-// This files provides a set of standard plugin features meant to be use
+// This file provides a set of standard plugin features meant to be used
// within clap_plugin_descriptor.features.
//
// For practical reasons we'll avoid spaces and use `-` instead to facilitate
// scripts that generate the feature array.
//
-// Non standard feature should be formated as follow: "$namespace:$feature"
+// Non-standard features should be formated as follow: "$namespace:$feature"
/////////////////////
// Plugin category //
