[WIP] [WIP] Address feedback on service rework implementation (#21)

* Initial plan

* Fix POST description in dc.py to use 'characters' instead of 'character'

Co-authored-by: morgangraphics <607594+morgangraphics@users.noreply.github.com>
Agent-Logs-Url: https://github.com/morgangraphics/simple-superhero-service-python/sessions/adfde50c-baa8-4475-92be-57a754fa9768

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: morgangraphics <607594+morgangraphics@users.noreply.github.com>

Author: Copilot

service/routes/dc.py

@@ -49,14 +49,14 @@
 
 ---
 
-**character: character can be a string, or an array of strings (preferred)** e.g.
+**characters: characters can be a string, or an array of strings (preferred)** e.g.
 
 ```json
-{ "character": "superman,batman" }
+{ "characters": "superman,batman" }
 ```
 OR
 ```json
-{ "character": ["superman", "batman"] }
+{ "characters": ["superman", "batman"] }
 ```
 
 **h: h can be a string, or an array (preferred)** e.g.