Forgot SGML section section id tag for 7.1.

doc/src/sgml/release.sgml

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  <appendix id="release">
@@ -112,7 +112,7 @@ Python fixes (Darcy)
   </sect1>
 
 
-  <sect1>
+  <sect1 id="release-7-1">
    <title>Release 7.1</title>
 
    <note>