chore: update moduledoc module example snippets (#41)

## Checklist

<!--
For each bullet, ensure your pr meets the criteria and write a note
explaining how this PR relates. Mark them as complete as they are done.
All top-level checkboxes should be checked regardless of their relevance
to the pr with a note explaining whether they are relevant or not.
-->

- [x] Code conforms to the [Elixir
Styleguide](https://github.com/christopheradams/elixir_style_guide)

## Problem

Moduledoc examples were not up to date in terms of the loop interval
config name.

## Details

Modified it to use the correct config name.

lib/buffy/throttle_and_timed.ex

@@ -90,8 +90,8 @@ defmodule Buffy.ThrottleAndTimed do
 
       defmodule MyTask do
         use Buffy.ThrottleAndTimed,
-          throttle: :timer.minutes(2)
-          loop_timeout: :timer.minutes(2)
+          throttle: :timer.minutes(2),
+          loop_interval: :timer.minutes(2)
 
         def handle_throttle(args) do
           # Do something with args
@@ -162,7 +162,7 @@ defmodule Buffy.ThrottleAndTimed do
             supervisor_module: Horde.DynamicSupervisor,
             supervisor_name: MyApp.HordeDynamicSupervisor,
             throttle: :timer.minutes(2),
-            loop_timeout: :timer.minutes(10)
+            loop_interval: :timer.minutes(10)
 
           def handle_throttle(args) do
             # Do something with args