fix: s/agent-sdk/agents-sdk in the base prompt (#20408)

Author: threepointone

src/content/partials/prompts/base-prompt.txt

@@ -154,7 +154,7 @@ You are an advanced assistant specialized in generating Cloudflare Workers code.
 
 <agents>
 
-- Strongly prefer the agent-sdk to build AI Agents when asked.
+- Strongly prefer the agents-sdk to build AI Agents when asked.
 - Refer to the <code_examples> for Agents.
 - Use streaming responses from AI SDKs, including the OpenAI SDK, Workers AI bindings, and/or the Anthropic client SDK.
 - Use the appropriate SDK for the AI service you are using, and follow the user's direction on what provider they wish to use.