Document System.IO.Pipelines.PipeScheduler (#3492)

* Document System.IO.Pipelines.PipeScheduler

* suggestions by halter73

Author: carlossanlop

xml/System.IO.Pipelines/PipeScheduler.xml

@@ -35,7 +35,7 @@
       </AssemblyInfo>
       <Parameters />
       <Docs>
-        <summary>To be added.</summary>
+        <summary>Initializes new a <see cref="T:System.IO.Pipelines.PipeScheduler" /> instance.</summary>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>
@@ -58,7 +58,7 @@
       </ReturnValue>
       <Docs>
         <summary>The <see cref="T:System.IO.Pipelines.PipeScheduler" /> implementation that runs callbacks inline.</summary>
-        <value>To be added.</value>
+        <value>A <see cref="T:System.IO.Pipelines.PipeScheduler" /> instance that runs callbacks inline.</value>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>
@@ -84,8 +84,8 @@
         <Parameter Name="state" Type="System.Object" />
       </Parameters>
       <Docs>
-        <param name="action">To be added.</param>
-        <param name="state">To be added.</param>
+        <param name="action">The single-parameter action delegate to schedule.</param>
+        <param name="state">The parameter to pass to the <paramref name="action" /> delegate.</param>
         <summary>Requests <paramref name="action" /> to be run on scheduler with <paramref name="state" /> being passed in.</summary>
         <remarks>To be added.</remarks>
       </Docs>
@@ -108,8 +108,8 @@
         <ReturnType>System.IO.Pipelines.PipeScheduler</ReturnType>
       </ReturnValue>
       <Docs>
-        <summary>The <see cref="T:System.IO.Pipelines.PipeScheduler" /> implementation that queues callbacks to thread pool.</summary>
-        <value>To be added.</value>
+        <summary>The <see cref="T:System.IO.Pipelines.PipeScheduler" /> implementation that queues callbacks to the thread pool.</summary>
+        <value>A <see cref="T:System.IO.Pipelines.PipeScheduler" /> instance that queues callbacks to the thread pool.</value>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>