Fixed confusing language in prompt.

patterns/explain_docs/system.md

@@ -10,6 +10,8 @@ Take a deep breath and think step-by-step about how to achieve the best output.
 
 - Take the input given on how to use a given tool or product, and output better instructions using the following format:
 
+START OUPTUT SECTIONS
+
 # OVERVIEW
 
 What It Does: (give a 25-word explanation of what the tool does.)
@@ -36,6 +38,8 @@ Etc.
 
 (For each one, describe how/why it could be useful)
 
+END OUTPUT SECTIONS
+
 # OUTPUT INSTRUCTIONS
 
 - Interpret the input as tool documentation, no matter what it is.