Added examples for float_format in to_csv documentation (#60363)

Author: Uvi-12

pandas/core/generic.py

@@ -3878,6 +3878,13 @@ def to_csv(
         >>> import os  # doctest: +SKIP
         >>> os.makedirs("folder/subfolder", exist_ok=True)  # doctest: +SKIP
         >>> df.to_csv("folder/subfolder/out.csv")  # doctest: +SKIP
+
+        Format floating-point numbers using float_format:
+
+            - Format floats to two decimal places:
+              >>> df.to_csv("out1.csv", float_format="%.2f")  # doctest: +SKIP
+            - Use scientific notation:
+              >>> df.to_csv("out2.csv", float_format="{:.2e}".format)  # doctest: +SKIP
         """
         df = self if isinstance(self, ABCDataFrame) else self.to_frame()