Clarify what specifying the module name does with & (#13668)

Author: jyc

lib/elixir/lib/kernel/special_forms.ex

@@ -1786,6 +1786,15 @@ defmodule Kernel.SpecialForms do
 
       &local_function/1
 
+  Note that `&local_function/1` creates a local capture, but
+  `&__MODULE__.local_function/1` or `&imported_function/1` create a remote
+  capture. For more information, refer to the ["Functions" section in the Erlang Reference Manual](https://www.erlang.org/doc/system/eff_guide_functions.html#function-calls).
+
+  Whether a capture is local or remote has implications when using hot code
+  reloading: local captures dispatch to the version of the module that existed
+  at the time they were created, while remote captures dispatch to the current
+  version of the module.
+
   See also `Function.capture/3`.
 
   ## Anonymous functions