Merge pull request matplotlib#28791 from meeseeksmachine/auto-backport-of-pr-28790-on-v3.9.x

Backport PR matplotlib#28790 on branch v3.9.x (DOC: Fix duplicate Figure.set_dpi entry)

Author: rcomer

doc/api/figure_api.rst

@@ -91,7 +91,7 @@ Figure geometry
    Figure.get_figwidth
    Figure.dpi
    Figure.set_dpi
-   Figure.set_dpi
+   Figure.get_dpi
 
 Subplot layout
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