DOC: SS06 Make summary for Index.where fit in one line

Author: laymonage

pandas/core/indexes/base.py

@@ -3953,9 +3953,9 @@ def memory_usage(self, deep: bool = False) -> int:
 
     def where(self, cond, other=None):
         """
-        Return an Index of same shape as self and whose corresponding
-        entries are from self where cond is True and otherwise are from
-        other.
+        Return a copy of self with entries replaced where cond is False.
+
+        The replacement is taken from other.
 
         Parameters
         ----------