Use typeparamref in ReadOnlySequence<T> summary (#1994)

Use typeparamref instead of typeparam in ReadOnlySequence<T> summary.

Author: watfordgnf

xml/System.Buffers/ReadOnlySequence`1.xml

@@ -25,7 +25,7 @@
   </Attributes>
   <Docs>
     <typeparam name="T">To be added.</typeparam>
-    <summary>Represents a sequence that can read a sequential series of <typeparam name="T" />.</summary>
+    <summary>Represents a sequence that can read a sequential series of <typeparamref name="T" />.</summary>
     <remarks>To be added.</remarks>
   </Docs>
   <Members>
@@ -691,4 +691,4 @@ The consumer is expected to manage the lifetime of memory until <see cref="T:Sys
       </Docs>
     </Member>
   </Members>
-</Type>
+</Type>