Update comments on get_plugin_factory()

Now that we do use a smart pointer to manage it ourselves, as proven
necessary by REAPER.

src/plugin/bridges/vst3.cpp

@@ -369,8 +369,8 @@ Steinberg::IPluginFactory* Vst3PluginBridge::get_plugin_factory() {
             new YaPluginFactoryImpl(*this, std::move(factory_args)));
     }
 
-    // Because we're returning a raw pointer, we have to increas the
-    // reference count ourselves
+    // Because we're returning a raw pointer, we have to increase the reference
+    // count ourselves
     plugin_factory->addRef();
 
     return plugin_factory;

src/plugin/bridges/vst3.h

@@ -63,9 +63,9 @@ class Vst3PluginBridge : PluginBridge<Vst3Sockets<std::jthread>> {
     /**
      * When the host loads the module it will call `GetPluginFactory()` which
      * will in turn call this function. The idea is that we return an
-     * `IPluginFactory*` while doing all the reference counting that `IPtr<T>`
-     * would normally do for us ourselves. This means that when the host frees
-     * its last instance of this factory, `plugin_factory` will also be cleared.
+     * `IPluginFactory*` that acts as an owned `IPtr<IPluginFactory>`, so we
+     * have to manually increase the reference count here for every plugin
+     * factory instance we return.
      *
      * @see plugin_factory
      */