feat(document): Add examples to custom living doc prompt builder

This commit adds support for including examples in the custom living doc prompt builder. The new feature allows the generation of prompts that include examples of questions and answers, which can be useful for guiding the model in providing more accurate responses.

Author: phodal

core/src/main/kotlin/cc/unitmesh/devti/custom/document/CustomLivingDocPromptBuilder.kt

@@ -48,6 +48,7 @@ class CustomLivingDocPromptBuilder(
 
             val lang = target.language.displayName;
             if (config.example != null) {
+                instruction.append("Examples: \n")
                 instruction.append("Question: ```$lang\n${config.example.question}\n```\n")
                 instruction.append("Answer: ${config.example.answer}\n")
                 instruction.append("Question: ```$lang\n${target.text}\n```\n")