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 25f0660467186d0c0a743a60f74dbd1acdb42e7f..ba38d218a91a4e9e9e9d6422958085fe664a9d30 100644 (file)
--- a/doc/src/sgml/mvcc.sgml
+++ b/doc/src/sgml/mvcc.sgml
@@ -1041,7 +1041,7 @@ ERROR:  could not serialize access due to read/write dependencies among transact
    
     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 ROLLBACK cancels all effects of the
     commands since the savepoint.  The same holds for locks acquired within a
     PL/pgSQL exception block: an error escape from the block