Update file-level comment for gin::IsolateHolder

gin/public/isolate_holder.h

Index: gin/public/isolate_holder.h
diff --git a/gin/public/isolate_holder.h b/gin/public/isolate_holder.h
index f82a53ac2fbcdbe5efb5baf25248e956ee708385..ee696f6550bb2220c6f169d07653699e3cb84896 100644
--- a/gin/public/isolate_holder.h
+++ b/gin/public/isolate_holder.h
@@ -16,12 +16,12 @@ class PerIsolateData;
 
 // To embed Gin, first create an instance of IsolateHolder to hold the
 // v8::Isolate in which you will execute JavaScript. You might wish to subclass
-// IsolateHolder if you want to tie more state to the lifetime of the
+// IsolateHolder if you want to tie more state to the lifetime of the isolate.
 //
 // You can use gin in two modes: either gin manages V8, or the gin-embedder
-// manages gin. If gin manages V8, use the IsolateHolder constructor without
-// parameters, otherwise, the gin-embedder needs to create v8::Isolates and
-// pass them to IsolateHolder.
+// manages gin. If gin manages V8, use the IsolateHolder constructor that does
+// not take an v8::Isolate parameter, otherwise, the gin-embedder needs to
+// create v8::Isolates and pass them to IsolateHolder.
 //
 // It is not possible to mix the two.
 class GIN_EXPORT IsolateHolder {