Fix broken resource link (#8447)

the [previous link](https://platform.openai.com/docs/guides/text-generation/managing-context-for-text-generation) directed to a 404 page. new link corrects this

src/data/roadmaps/ai-engineer/content/capabilities--context-length@vvpYkmycH0_W030E-L12f.md

@@ -4,5 +4,5 @@ A key aspect of the OpenAI models is their context length, which refers to the a
 
 Learn more from the following resources:
 
-- [@official@Managing Context](https://platform.openai.com/docs/guides/text-generation/managing-context-for-text-generation)
+- [@official@Managing Context](https://platform.openai.com/docs/guides/conversation-state?api-mode=responses#managing-context-for-text-generation)
 - [@official@Capabilities](https://platform.openai.com/docs/guides/text-generation)