removed mention that 'dims' are inferred from 'coords'-dict when omit… (#3821)

* removed mention that 'dims' are inferred from 'coords'-dict when omitted in DataArray (fixes #3820)

* added summary of PR #3821 to whats-new

Author: sjvrijn

doc/whats-new.rst

@@ -71,6 +71,9 @@ Bug fixes
 
 Documentation
 ~~~~~~~~~~~~~
+- Fix documentation of :py:class:`DataArray` removing the deprecated mention
+  that when omitted, `dims` are inferred from a `coords`-dict. (:pull:`3821`)
+  By `Sander van Rijn <https://github.com/sjvrijn>`_.
 
 Internal Changes
 ~~~~~~~~~~~~~~~~

xarray/core/dataarray.py

@@ -304,8 +304,7 @@ def __init__(
             Name(s) of the data dimension(s). Must be either a hashable (only
             for 1D data) or a sequence of hashables with length equal to the
             number of dimensions. If this argument is omitted, dimension names
-            are taken from ``coords`` (if possible) and otherwise default to
-            ``['dim_0', ... 'dim_n']``.
+            default to ``['dim_0', ... 'dim_n']``.
         name : str or None, optional
             Name of this array.
         attrs : dict_like or None, optional