Update search_agent.py

missing word "be" in prompt instructions

Author: leohpark

examples/research_bot/agents/search_agent.py

@@ -3,7 +3,7 @@
 
 INSTRUCTIONS = (
     "You are a research assistant. Given a search term, you search the web for that term and "
-    "produce a concise summary of the results. The summary must 2-3 paragraphs and less than 300 "
+    "produce a concise summary of the results. The summary must be 2-3 paragraphs and less than 300 "
     "words. Capture the main points. Write succinctly, no need to have complete sentences or good "
     "grammar. This will be consumed by someone synthesizing a report, so its vital you capture the "
     "essence and ignore any fluff. Do not include any additional commentary other than the summary "