DOC: Examples added for float_format in to_csv documentation (#60457)

* Checking for the first link added

* DOC: Added missing links to optional dependencies in getting_started/install.html

* DOC: Examples added for float_format in to_csv documentation

* Updated the float_format based on suggested change

* Changes made according to the review

pandas/core/generic.py

@@ -3878,6 +3878,14 @@ 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 floats to two decimal places:
+
+        >>> df.to_csv("out1.csv", float_format="%.2f")  # doctest: +SKIP
+
+        Format floats using scientific notation:
+
+        >>> df.to_csv("out2.csv", float_format="{{:.2e}}".format)  # doctest: +SKIP
         """
         df = self if isinstance(self, ABCDataFrame) else self.to_frame()