Some doc string changes

Author: topper-123

pandas/core/indexes/range.py

@@ -188,6 +188,13 @@ def _constructor(self):
 
     @property
     def _data(self):
+        """
+        An int array that for performance reasons is created only when needed.
+
+        The constructed array is saved in ``_cached_data``. This allows us to
+        check if the array has been created without accessing ``_data`` and
+        triggering the construction.
+        """
         if self._cached_data is None:
             self._cached_data = np.arange(self._start, self._stop, self._step,
                                           dtype=np.int64)

pandas/tests/indexes/test_range.py

@@ -242,6 +242,7 @@ def test_dtype(self):
         assert self.index.dtype == np.int64
 
     def test_cached_data(self):
+        # GH 26565
         # Calling RangeIndex._data caches an int64 array of the same length at
         # self._cached_data. This tests whether _cached_data has been set.
         idx = RangeIndex(0, 100, 10)