Add missing return values for VectorX.Create(ROS<float> values) (#10511)

Author: jeffhandley

xml/System.Numerics/Vector2.xml

@@ -663,7 +663,7 @@
       <Docs>
         <param name="values">The span of elements to assign to the vector.</param>
         <summary>Constructs a vector from the given <see cref="T:System.ReadOnlySpan`1" />. The span must contain at least 2 elements.</summary>
-        <returns>To be added.</returns>
+        <returns>A new <see cref="T:System.Numerics.Vector2" /> whose elements have the specified values.</returns>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>

xml/System.Numerics/Vector3.xml

@@ -709,7 +709,7 @@
       <Docs>
         <param name="values">The span of elements to assign to the vector.</param>
         <summary>Constructs a vector from the given <see cref="T:System.ReadOnlySpan`1" />. The span must contain at least 3 elements.</summary>
-        <returns>To be added.</returns>
+        <returns>A new <see cref="T:System.Numerics.Vector3" /> whose elements have the specified values.</returns>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>

xml/System.Numerics/Vector4.xml

@@ -757,7 +757,7 @@
       <Docs>
         <param name="values">The span of elements to assign to the vector.</param>
         <summary>Constructs a vector from the given <see cref="T:System.ReadOnlySpan`1" />. The span must contain at least 4 elements.</summary>
-        <returns>To be added.</returns>
+        <returns>A new <see cref="T:System.Numerics.Vector4" /> whose elements have the specified values.</returns>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>