port some docs from intellisense (#11487)

Author: gewarren

xml/System.Net/IPAddress.xml

@@ -2721,10 +2721,10 @@ The scope identifier is &gt; 0x00000000FFFFFFFF</exception>
         <Parameter Name="provider" Type="System.IFormatProvider" Index="1" FrameworkAlternate="net-10.0" />
       </Parameters>
       <Docs>
-        <param name="utf8Text">To be added.</param>
-        <param name="provider">To be added.</param>
-        <summary>To be added.</summary>
-        <returns>To be added.</returns>
+        <param name="utf8Text">The span of UTF-8 characters to parse.</param>
+        <param name="provider">An object that provides culture-specific formatting information about <paramref name="utf8Text" />.</param>
+        <summary>Parses a span of UTF-8 characters into a value.</summary>
+        <returns>The result of parsing <paramref name="utf8Text" />.</returns>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>

xml/System.Net/IPNetwork.xml

@@ -678,10 +678,10 @@
         <Parameter Name="provider" Type="System.IFormatProvider" Index="1" FrameworkAlternate="net-10.0" />
       </Parameters>
       <Docs>
-        <param name="utf8Text">To be added.</param>
-        <param name="provider">To be added.</param>
-        <summary>To be added.</summary>
-        <returns>To be added.</returns>
+        <param name="utf8Text">The span of UTF-8 characters to parse.</param>
+        <param name="provider">An object that provides culture-specific formatting information about <paramref name="utf8Text" />.</param>
+        <summary>Parses a span of UTF-8 characters into a value.</summary>
+        <returns>The result of parsing <paramref name="utf8Text" />.</returns>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>