Fix docstring errors

Author: snitish

pandas/core/window/expanding.py

@@ -285,11 +285,11 @@ def pipe(
     value in one pass, you can do
 
     >>> df.expanding().pipe(lambda x: x.max() - x.min())
-                A
-    2012-08-02  0
-    2012-08-03  1
-    2012-08-04  2
-    2012-08-05  3""",
+                  A
+    2012-08-02  0.0
+    2012-08-03  1.0
+    2012-08-04  2.0
+    2012-08-05  3.0""",
     )
     @Appender(template_pipe)
     def pipe(

pandas/core/window/rolling.py

@@ -2112,11 +2112,11 @@ def pipe(
     value in one pass, you can do
 
     >>> df.rolling('2D').pipe(lambda x: x.max() - x.min())
-                A
-    2012-08-02  0
-    2012-08-03  1
-    2012-08-04  1
-    2012-08-05  1""",
+                  A
+    2012-08-02  0.0
+    2012-08-03  1.0
+    2012-08-04  1.0
+    2012-08-05  1.0""",
     )
     @Appender(template_pipe)
     def pipe(