fix the validation errors

Author: Akashisang

pandas/core/window/expanding.py

@@ -1138,11 +1138,12 @@ def quantile(
             when the desired quantile lies between two data points `i` and `j`:
 
                 * linear: `i + (j - i) * fraction`, where `fraction` is the
-                fractional part of the index surrounded by `i` and `j`.
+                  fractional part of the index surrounded by `i` and `j`.
                 * lower: `i`.
                 * higher: `j`.
                 * nearest: `i` or `j` whichever is nearest.
                 * midpoint: (`i` + `j`) / 2.
+
         numeric_only : bool, default False
             Include only float, int, boolean columns.