doc: quickfix example title format

FelSiq · FelSiq · commit d052785b62e4 · 2022-10-04T12:33:03.000-03:00
diff --git a/examples/03_miscellaneous_examples/plot_extraction_total_elapsed_time.py b/examples/03_miscellaneous_examples/plot_extraction_total_elapsed_time.py
@@ -1,6 +1,6 @@
 """
 Plotting elapsed time in a meta-feature extraction
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+==================================================
 
 In this example, we will show you how the default value `max_attr_num` of
 meta-feature `attr_conc` was defined based on the total elapsed time of
