doc: Add a link target

Forward-patched from PostgreSQL 12 release notes patch, for
consistency.

diff --git a/doc/src/sgml/ref/alter_table.sgml b/doc/src/sgml/ref/alter_table.sgml
index 90bf19564c6801113fa360c95713f339152c2772..cb9b60415dec53acb99e0876324ee5b843782bdd 100644 (file)
--- a/doc/src/sgml/ref/alter_table.sgml
+++ b/doc/src/sgml/ref/alter_table.sgml
@@ -831,7 +831,7 @@ WITH ( MODULUS <replaceable class="parameter">numeric_literal</replaceable>, REM
     </listitem>
    </varlistentry>
 
-   <varlistentry>
+   <varlistentry id="sql-altertable-attach-partition">
     <term><literal>ATTACH PARTITION <replaceable class="parameter">partition_name</replaceable> { FOR VALUES <replaceable class="parameter">partition_bound_spec</replaceable> | DEFAULT }</literal></term>
     <listitem>
      <para>