More FreeBSD jail wording improvements.

doc/src/sgml/runtime.sgml

-<!-- $PostgreSQL: pgsql/doc/src/sgml/runtime.sgml,v 1.368 2006/04/11 19:42:27 momjian Exp $ -->
+<!-- $PostgreSQL: pgsql/doc/src/sgml/runtime.sgml,v 1.369 2006/04/11 19:45:33 momjian Exp $ -->
 
 <chapter Id="runtime">
  <title>Operating System Environment</title>
@@ -768,8 +768,8 @@ options "SEMMNS=240"
         <literal>security.jail.sysvipc_allowed</>, <application>postmaster</>s
         running in different jails should be run by different operating system
         users.  This improves security because it prevents non-root users
-        from interfering with shared memory or semaphores in different jail, and it
-        allows the PostgreSQL IPC cleanup code to function properly.
+        from interfering with shared memory or semaphores in a different jail,
+        and it allows the PostgreSQL IPC cleanup code to function properly.
         (In FreeBSD 6.0 and later the IPC cleanup code doesn't properly detect
         processes in other jails, preventing the running of postmasters on the
         same port in different jails.)