chore(doc): auto generate docs

Author: github-actions[bot]

doc/CopilotChat.txt

@@ -272,6 +272,7 @@ System prompts define the AI model’s behavior. Reference them with
 
   Prompt                 Description
   ---------------------- --------------------------------------------
+  COPILOT_BASE           All prompts should be built on top of this
   COPILOT_INSTRUCTIONS   Base instructions
   COPILOT_EXPLAIN        Adds coding tutor behavior
   COPILOT_REVIEW         Adds code review behavior with diagnostics
@@ -282,6 +283,9 @@ Define your own system prompts in the configuration (similar to `prompts`):
       prompts = {
         Yarrr = {
           system_prompt = 'You are fascinated by pirates, so please respond in pirate speak.',
+        },
+        NiceInstructions = {
+          system_prompt = 'You are a nice coding tutor, so please respond in a friendly and helpful manner.' .. require('CopilotChat.config.prompts').COPILOT_BASE.system_prompt,
         }
       }
     }