doc: restore wording from recent patch "rolled back to"

Reported-by: Tom Lane
Discussion: https://postgr.es/m/31072.1585690490@sss.pgh.pa.us

Backpatch-through: 9.5 - 12

diff --git a/doc/src/sgml/mvcc.sgml b/doc/src/sgml/mvcc.sgml
index ce00455ec2f9339a410946b332c1d8182601e1a1..ee47fb6038273ced635edd352cb066281e588e0e 100644 (file)
--- a/doc/src/sgml/mvcc.sgml
+++ b/doc/src/sgml/mvcc.sgml
@@ -1034,7 +1034,7 @@ ERROR:  could not serialize access due to read/write dependencies among transact
    <para>
     Once acquired, a lock is normally held until the end of the transaction.  But if a
     lock is acquired after establishing a savepoint, the lock is released
-    immediately if the savepoint is rolled back.  This is consistent with
+    immediately if the savepoint is rolled back to.  This is consistent with
     the principle that <command>ROLLBACK</> cancels all effects of the
     commands since the savepoint.  The same holds for locks acquired within a
     <application>PL/pgSQL</> exception block: an error escape from the block