Remove misleading comment in .app file

The comment says don't list applications which are load only,
just above the line listing stdlib which is load only.

It is very misleading to newcomers so best to remove it.

src/gproc.app.src

@@ -8,7 +8,6 @@
   {vsn, git},
   {id, "GPROC"},
   {registered, [ ] },
-  %% NOTE: do not list applications which are load-only!
   {applications, [ kernel, stdlib ] },
   {mod, {gproc_app, []} }
  ]