Update Tensor`1.xml

Author: gewarren

xml/System.Numerics.Tensors/Tensor`1.xml

@@ -47,7 +47,7 @@
   </Attributes>
   <Docs>
     <typeparam name="T">To be added.</typeparam>
-    <summary>
+    <summary>Test
             Represents a tensor.
             </summary>
     <remarks>To be added.</remarks>