Port System.Runtime new docs (#10158)

* System.Runtime

* System.Runtime.Serialization

* System.Timers

---------

Co-authored-by: Genevieve Warren <[email protected]>

Author: carlossanlop

xml/System.Runtime.Serialization/ISerializationCodeDomSurrogateProvider.xml

@@ -18,7 +18,7 @@
     </Attribute>
   </Attributes>
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Represents a DataContract surrogate provider that is capable of modifying generated type code using <see cref="N:System.CodeDom" />.</summary>
     <remarks>To be added.</remarks>
   </Docs>
   <Members>
@@ -43,10 +43,10 @@
         <Parameter Name="compileUnit" Type="System.CodeDom.CodeCompileUnit" />
       </Parameters>
       <Docs>
-        <param name="typeDeclaration">To be added.</param>
-        <param name="compileUnit">To be added.</param>
-        <summary>To be added.</summary>
-        <returns>To be added.</returns>
+        <param name="typeDeclaration">A <see cref="T:System.CodeDom.CodeTypeDeclaration" /> to process that represents the type declaration generated during schema import.</param>
+        <param name="compileUnit">The <see cref="T:System.CodeDom.CodeCompileUnit" /> that contains the other code generated during schema import.</param>
+        <summary>Processes the type that has been generated from the imported schema.</summary>
+        <returns>A <see cref="T:System.CodeDom.CodeTypeDeclaration" /> that contains the processed type.</returns>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>

xml/System.Runtime/DefaultTaskSchedulerAwaiter.xml

@@ -130,8 +130,8 @@
         <Parameter Name="continuation" Type="System.Action" />
       </Parameters>
       <Docs>
-        <param name="continuation">To be added.</param>
-        <summary>To be added.</summary>
+        <param name="continuation">The action to invoke when the operation completes.</param>
+        <summary>Schedules the continuation action that's invoked when the instance completes.</summary>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>

xml/System.Timers/ElapsedEventArgs.xml

@@ -79,8 +79,8 @@
         <Parameter Name="signalTime" Type="System.DateTime" Index="0" FrameworkAlternate="net-9.0" />
       </Parameters>
       <Docs>
-        <param name="signalTime">To be added.</param>
-        <summary>To be added.</summary>
+        <param name="signalTime">The time when the timer elapsed.</param>
+        <summary>Initializes a new instance of the <see cref="T:System.Timers.ElapsedEventArgs" /> class.</summary>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>