Fix typo in bug search instructions

Author: remyduthu

content/posts/2025-09-04-look-for-bugs.dj

@@ -62,7 +62,7 @@ use these two other frames:
 
 : Stare at the state
 
-  Identify the key data structures and fields, and search for all all places where they are
+  Identify the key data structures and fields, and search for all places where they are
   created and modified.
 
 You want to see a slice across space and time, state and control flow (c.f.