copyedit checklist readme

Author: BenLloydPearson

plugins/filters/checklist/README.md

@@ -1,3 +1,7 @@
+--8<-- "plugins/filters/checklist/reference.md"
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+With this plugin, you can easily customize the checklist using the object in the JavaScript code. To add a new check to the list, just add a new object with a descriptive `title` for your own benefit, a `label` that'll get posted in the comment, and the `condition` that, if true, would cause the entry in the checklist to be checked off.
+
 ??? note "Plugin Code: checklist"
     ```javascript
     --8<-- "plugins/filters/checklist/index.js"
@@ -7,7 +11,6 @@
     </span>
     </div>
 
-With this plugin, you can easily customize the checklist using the object in the JavaScript code. To add a new check to the list, just add a new object with a descriptive `title` for your own benefit, a `label` that'll get posted in the comment, and the `condition` that, if true, would cause the entry in the checklist to be checked off.
 
 ??? example "gitStream CM Example: checklist"
     ```yaml+jinja
@@ -19,3 +22,5 @@ With this plugin, you can easily customize the checklist using the object in the
     </div>
 
 [Download Source Code](https://github.com/linear-b/gitstream/tree/main/plugins/filters/checklist)
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+