docs: update save function name for bar plot in documentation

docs/index.qmd

@@ -143,7 +143,7 @@ plt.ylabel("Body Mass (g)")
 maidr.show(bar_plot) #<<
 
 # Uncomment the following line to save and share the accessible version of your plot with others!
-# maidr.save(bar_plot, "output.html") #<<
+# maidr.save_html(bar_plot, "output.html") #<<
 ```
 
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