Merge pull request numpy#15370 from MLK97/DOC_correction_15360

DOC: Updating Chararry Buffer datatypes numpy#15360

numpy/core/defchararray.py

@@ -1908,7 +1908,7 @@ class adds the following functionality:
     unicode : bool, optional
         Are the array elements of type unicode (True) or string (False).
         Default is False.
-    buffer : int, optional
+    buffer : object exposing the buffer interface or str, optional
         Memory address of the start of the array data.  Default is None,
         in which case a new array is created.
     offset : int, optional