HeaderDoc support in the library and generated sources
- Convert most of the core library headers over to HeaderDoc format.
- Switch the generated comments over to HeaderDoc.
- Create GPBCodedOutputStream_PackagePrivate and move some things into there
that should be more internal.
diff --git a/objectivec/GPBRootObject.h b/objectivec/GPBRootObject.h
index e2af5d9..c05b5c6 100644
--- a/objectivec/GPBRootObject.h
+++ b/objectivec/GPBRootObject.h
@@ -34,11 +34,12 @@
NS_ASSUME_NONNULL_BEGIN
-// All Root Objects derive from GPBRootObject. It supplies a registry
-// for derived classes to register their extensions to.
+/// Every generated proto file defines a local "Root" class that exposes a
+/// @c GPBExtensionRegistry for all the extensions defined by that file and
+/// the files it depends on.
@interface GPBRootObject : NSObject
-// Per class registry.
+/// An extension registry for the given file and all the files it depends on.
+ (GPBExtensionRegistry *)extensionRegistry;
@end