docs: PG 12 relnote wording fix

bmomjian · bmomjian · commit 3ceaed106d95 · 2019-05-28T07:17:34.000-04:00
Reported-by: Gaby Schilders
diff --git a/doc/src/sgml/release-12.sgml b/doc/src/sgml/release-12.sgml
@@ -2611,7 +2611,7 @@ Author: Michael Paquier <michael@paquier.xyz>
 -->
 
       <para>
-       Add vacuumdb to disable waiting for locks or skipping all-visible
+       Allow vacuumdb to disable waiting for locks or skipping all-visible
        pages (Nathan Bossart)
       </para>
 
