MVCC doc typo fix

*** a/doc/src/sgml/mvcc.sgml
--- b/doc/src/sgml/mvcc.sgml
***************
*** 670,676 **** ERROR:  could not serialize access due to read/write dependencies among transact
       permanent database writes within Serializable transactions on the
       master will ensure that all standbys will eventually reach a consistent
       state, a Repeatable Read transaction run on the standby can sometimes
!      see a transient state which in inconsistent with any serial execution
       of serializable transactions on the master.
      </para>
     </warning>
--- 670,676 ----
       permanent database writes within Serializable transactions on the
       master will ensure that all standbys will eventually reach a consistent
       state, a Repeatable Read transaction run on the standby can sometimes
!      see a transient state which is inconsistent with any serial execution
       of serializable transactions on the master.
      </para>
     </warning>