src: update f function call comment

Commit a01e8bc (src: moving f function call comment, 2016-09-04) moved
a comment to be closer to the place in the code it was describing.
While working on this there was feedback on the comment
itself:
https://github.com/nodejs/node/commit/
a01e8bc#comments

This PR includes the suggestions in the above comments.

PR-URL: nodejs#8416
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
Reviewed-By: Franziska Hinkelmann <franzih@chromium.org>
Reviewed-By: James M Snell <jasnell@gmail.com>

src/node.cc

@@ -3418,11 +3418,11 @@ void LoadEnvironment(Environment* env) {
   global->Set(FIXED_ONE_BYTE_STRING(env->isolate(), "global"), global);
 
   // Now we call 'f' with the 'process' variable that we've built up with
-  // all our bindings. Inside bootstrap_node.js we'll take care of
-  // assigning things to their places.
+  // all our bindings. Inside bootstrap_node.js and internal/process we'll
+  // take care of assigning things to their places.
 
   // We start the process this way in order to be more modular. Developers
-  // who do not like how bootstrap_node.js setups the module system but do
+  // who do not like how bootstrap_node.js sets up the module system but do
   // like Node's I/O bindings may want to replace 'f' with their own function.
   Local<Value> arg = env->process_object();
   f->Call(Null(env->isolate()), 1, &arg);