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 numeric_literal, REM
     
    
 
-   
+    id="sql-altertable-attach-partition">
     ATTACH PARTITION partition_name { FOR VALUES partition_bound_spec | DEFAULT }