Merge pull request numpy#26629 from luxedo/DOC/21351/np/unique_all

DOC: add `unique_all` example

Author: mattip

numpy/lib/_arraysetops_impl.py

@@ -433,6 +433,14 @@ def unique_all(x):
     --------
     unique : Find the unique elements of an array.
 
+    Examples
+    --------
+    >>> np.unique_all([1, 1, 2])
+    UniqueAllResult(values=array([1, 2]),
+                    indices=array([0, 2]),
+                    inverse_indices=array([0, 0, 1]),
+                    counts=array([2, 1]))
+
     """
     result = unique(
         x,