Backport PR #57510 on branch 2.2.x (DOC: Fix xarray example) (#57538)

DOC: Fix xarray example (#57510)

* DOC: Fix xarray example

* Update

* Skip doctest

* Igore another doctest

---------

Co-authored-by: Matthew Roeschke <10647082+mroeschke@users.noreply.github.com>

(cherry picked from commit 33a1cd7)

Author: phofl

pandas/core/generic.py

@@ -3278,18 +3278,18 @@ def to_xarray(self):
         2    lion  mammal       80.5         4
         3  monkey  mammal        NaN         4
 
-        >>> df.to_xarray()
+        >>> df.to_xarray()  # doctest: +SKIP
         <xarray.Dataset>
         Dimensions:    (index: 4)
         Coordinates:
-          * index      (index) int64 0 1 2 3
+          * index      (index) int64 32B 0 1 2 3
         Data variables:
-            name       (index) object 'falcon' 'parrot' 'lion' 'monkey'
-            class      (index) object 'bird' 'bird' 'mammal' 'mammal'
-            max_speed  (index) float64 389.0 24.0 80.5 nan
-            num_legs   (index) int64 2 2 4 4
+            name       (index) object 32B 'falcon' 'parrot' 'lion' 'monkey'
+            class      (index) object 32B 'bird' 'bird' 'mammal' 'mammal'
+            max_speed  (index) float64 32B 389.0 24.0 80.5 nan
+            num_legs   (index) int64 32B 2 2 4 4
 
-        >>> df['max_speed'].to_xarray()
+        >>> df['max_speed'].to_xarray()  # doctest: +SKIP
         <xarray.DataArray 'max_speed' (index: 4)>
         array([389. ,  24. ,  80.5,   nan])
         Coordinates:
@@ -3311,7 +3311,7 @@ class      (index) object 'bird' 'bird' 'mammal' 'mammal'
         2018-01-02 falcon    361
                    parrot     15
 
-        >>> df_multiindex.to_xarray()
+        >>> df_multiindex.to_xarray()  # doctest: +SKIP
         <xarray.Dataset>
         Dimensions:  (date: 2, animal: 2)
         Coordinates: