Fixing indentation of example of DataFrame (#40544)

Author: juliansmidek

pandas/core/frame.py

@@ -528,7 +528,7 @@ class DataFrame(NDFrame, OpsMixin):
     >>> from dataclasses import make_dataclass
     >>> Point = make_dataclass("Point", [("x", int), ("y", int)])
     >>> pd.DataFrame([Point(0, 0), Point(0, 3), Point(2, 3)])
-        x  y
+       x  y
     0  0  0
     1  0  3
     2  2  3