remove cref link (dotnet#3466)

* remove cref link

* feedback

Author: mairaw

xml/System.Buffers/ArrayPool`1.xml

@@ -25,7 +25,7 @@
   <Interfaces />
   <Docs>
     <typeparam name="T">The type of the objects that are in the resource pool.</typeparam>
-    <summary>Provides a resource pool that enables reusing instances of type <see cref="T:T[]" />.</summary>
+    <summary>Provides a resource pool that enables reusing instances of type T[].</summary>
     <remarks>
       <format type="text/markdown"><![CDATA[  
   
@@ -168,7 +168,7 @@ The instance of the <xref:System.Buffers.ArrayPool%601> class created by this me
       <Docs>
         <param name="minimumLength">The minimum length of the array.</param>
         <summary>Retrieves a buffer that is at least the requested length.</summary>
-        <returns>An array of type <see cref="T:T[]" /> that is at least <paramref name="minimumLength" /> in length.</returns>
+        <returns>An array of type T that is at least <paramref name="minimumLength" /> in length.</returns>
         <remarks>
           <format type="text/markdown"><![CDATA[