doc: add xreflabel for libpq chapter, needed for PG 14 relnotes

diff --git a/doc/src/sgml/libpq.sgml b/doc/src/sgml/libpq.sgml
index 875950b83c0e2c0c97753a603025e2ce6066611e..4b1294f404fdef775e634a930167658ba9a0af12 100644 (file)
--- a/doc/src/sgml/libpq.sgml
+++ b/doc/src/sgml/libpq.sgml
@@ -1,6 +1,6 @@
 <!-- doc/src/sgml/libpq.sgml -->
 
-<chapter id="libpq">
+<chapter id="libpq" xreflabel="libpq">
  <title><application>libpq</application> &mdash; C Library</title>
 
  <indexterm zone="libpq">