Update description of wikiagent task

basic_agent.py

@@ -63,7 +63,7 @@ class BasicAgent:
 
         wiki_agent = FunctionAgent(
             name="WikiAgent",
-            description="Uses wikipedia to answer a question.",
+            description="Agent that can access Wikipedia to answer a question. Try using this agent if the WebAgent does not find an answer to a question.",
             system_prompt=(
                 "You are a Wikipedia agent that can search Wikipedia for information and extract the relevant information to answer a question. "
                 "You only give concise answers and if you don't find an answer to the given query on Wikipedia, "