Drop "C" from "C core"

src/core/README.md

@@ -1,5 +1,6 @@
-# Shared C-core library
+# gRPC core library
+
+This shared library provides all of gRPC's core functionality through a low
+level API. gRPC libraries for the other languages supported in this repo, are
+built on top of this shared core library.
 
-This library provides all of gRPC's core functionality through a low level API.
-gRPC libraries for the other languages supported in this repo, are built on
-top of this shared C-core library.