Fixing predict docs (#16637)

Co-authored-by: UltralyticsAssistant <web@ultralytics.com>
Co-authored-by: Glenn Jocher <glenn.jocher@ultralytics.com>

ultralytics/engine/exporter.py

@@ -183,9 +183,9 @@ class Exporter:
 
             # Get the closest match if format is invalid
             matches = difflib.get_close_matches(fmt, fmts, n=1, cutoff=0.6)  # 60% similarity required to match
-            if closest_match:
+            if matches:
                 LOGGER.warning(f"WARNING ⚠️ Invalid export format='{fmt}', updating to format='{matches[0]}'")
-                fmt = closest_match[0]
+                fmt = matches[0]
             else:
                 raise ValueError(f"Invalid export format='{fmt}'. Valid formats are {fmts}")
         flags = [x == fmt for x in fmts]