Replace <see langword="UInt64" /> tags (#3907)

* Replace <see langword="UInt64" /> tags

* Apply suggestions from code review

Co-Authored-By: Jeremy Barton <[email protected]>

Co-authored-by: Jeremy Barton <[email protected]>

Author: nxtn

xml/System.Runtime.Serialization/SerializationInfo.xml

@@ -1043,7 +1043,7 @@ End Sub
       </Parameters>
       <Docs>
         <param name="name">The name to associate with the value, so it can be deserialized later.</param>
-        <param name="value">The <see langword="UInt64" /> value to serialize.</param>
+        <param name="value">The value to serialize.</param>
         <summary>Adds a 64-bit unsigned integer value into the <see cref="T:System.Runtime.Serialization.SerializationInfo" /> store.</summary>
         <remarks>
           <format type="text/markdown"><![CDATA[  

xml/System.Xml/XmlConvert.xml

@@ -2457,7 +2457,7 @@ writer.WriteElementString(XmlConvert.EncodeName("Order Detail"),"My order");
       <Docs>
         <param name="value">The value to convert.</param>
         <summary>Converts the <see cref="T:System.UInt64" /> to a <see cref="T:System.String" />.</summary>
-        <returns>A string representation of the <see langword="UInt64" />.</returns>
+        <returns>A string representation of the <see cref="T:System.UInt64" />.</returns>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>
@@ -2803,7 +2803,7 @@ writer.WriteElementString(XmlConvert.EncodeName("Order Detail"),"My order");
       <Docs>
         <param name="s">The string to convert.</param>
         <summary>Converts the <see cref="T:System.String" /> to a <see cref="T:System.UInt64" /> equivalent.</summary>
-        <returns>A <see langword="UInt64" /> equivalent of the string.</returns>
+        <returns>A <see cref="T:System.UInt64" /> equivalent of the string.</returns>
         <remarks>To be added.</remarks>
         <exception cref="T:System.ArgumentNullException">
           <paramref name="s" /> is <see langword="null" />.</exception>