Add pause_at_recovery_target to recovery.conf.sample; improve docs.

Fujii Masao, but with the proposed behavior change reverted, and the
rest adjusted accordingly.

doc/src/sgml/recovery-config.sgml

@@ -261,7 +261,7 @@ restore_command = 'copy "C:\\server\\archivedir\\%f" "%p"'  # Windows
       <listitem>
        <para>
         Specifies whether recovery should pause when the recovery target
-        is reached. The default is true, if a recovery target is set.
+        is reached. The default is true.
         This is intended to allow queries to be executed against the
         database to check if this recovery target is the most desirable
         point for recovery. The paused state can be resumed by using
@@ -272,6 +272,10 @@ restore_command = 'copy "C:\\server\\archivedir\\%f" "%p"'  # Windows
         recovery target settings to a later target and restart to
         continue recovery.
        </para>
+       <para>
+        This setting has no effect if <xref linkend="guc-hot-standby"> is not
+        enabled, or if no recovery target is set.
+       </para>
       </listitem>
      </varlistentry>
 

src/backend/access/transam/recovery.conf.sample

@@ -87,6 +87,14 @@
 #
 #recovery_target_timeline = 'latest'
 #
+#
+# If pause_at_recovery_target is enabled, recovery will pause when
+# the recovery target is reached. The pause state will continue until
+# pg_xlog_replay_resume() is called. This setting has no effect if
+# hot standby is not enabled, or if no recovery target is set.
+#
+#pause_at_recovery_target = true
+#
 #---------------------------------------------------------------------------
 # STANDBY SERVER PARAMETERS
 #---------------------------------------------------------------------------