Document P0811R3 status in C++20 table

2019-05-13  Edward Smith-Rowland  <3dw4rd@verizon.net>

	* doc/xml/manual/status_cxx2020.xml: Document P0811R3 status.

From-SVN: r271122

libstdc++-v3/ChangeLog

+2019-05-13  Edward Smith-Rowland  <3dw4rd@verizon.net>
+
+	* doc/xml/manual/status_cxx2020.xml: Document P0811R3 status.
+
 2019-05-13  Jonathan Wakely  <jwakely@redhat.com>
 
 	Remove Profile Mode, deprecated since 7.1.0

libstdc++-v3/doc/xml/manual/status_cxx2020.xml

@@ -934,6 +934,17 @@ Feature-testing recommendations for C++</link>.
     </row>
 
     <row>
+      <entry>  Well-behaved interpolation for numbers and pointers </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p0811r3.html">
+	P0811R3
+	</link>
+      </entry>
+      <entry align="center"> 9.1 </entry>
+      <entry />
+    </row>
+
+    <row>
       <?dbhtml bgcolor="#B0B0B0" ?>
       <entry>  Missing feature test macros </entry>
       <entry>