Fix styler excel example - take 2 (#49996)

* fix styler excel example

TypeError: <lambda>() takes 0 positional arguments but 1 was given

* remove doctest: +SKIP

Author: janosh

pandas/io/formats/style_render.py

@@ -1110,8 +1110,7 @@ def format(
 
         >>> df = pd.DataFrame({"A": [1, 0, -1]})
         >>> pseudo_css = "number-format: 0§[Red](0)§-§@;"
-        >>> df.style.applymap(lambda: pseudo_css).to_excel("formatted_file.xlsx")
-        ...  # doctest: +SKIP
+        >>> df.style.applymap(lambda v: pseudo_css).to_excel("formatted_file.xlsx")
 
         .. figure:: ../../_static/style/format_excel_css.png
         """