doc: Fix links to pg_stat_replication

In PostgreSQL 9.5, the documentation for pg_stat_replication was moved,
so some of the links pointed to an appropriate location.

Author: Maksim Milyutin <milyutinma@gmail.com>

doc/src/sgml/config.sgml

@@ -3123,7 +3123,7 @@ include_dir 'conf.d'
         in this list, and
         that are both currently connected and streaming data in real-time
         (as shown by a state of <literal>streaming</literal> in the
-        <link linkend="monitoring-stats-views-table">
+        <link linkend="pg-stat-replication-view">
         <literal>pg_stat_replication</literal></link> view).
         Specifying more than one synchronous standby can allow for very high
         availability and protection against data loss.
@@ -3371,7 +3371,7 @@ ANY <replaceable class="parameter">num_sync</replaceable> ( <replaceable class="
        Specifies the minimum frequency for the WAL receiver
        process on the standby to send information about replication progress
        to the primary or upstream standby, where it can be seen using the
-       <link linkend="monitoring-stats-views-table">
+       <link linkend="pg-stat-replication-view">
        <literal>pg_stat_replication</literal></link> view.  The standby will report
        the last write-ahead log location it has written, the last position it
        has flushed to disk, and the last position it has applied.

doc/src/sgml/release-10.sgml

@@ -3743,7 +3743,7 @@ Branch: REL_10_STABLE [5159626af] 2017-11-03 14:14:16 -0400
 -->
       <para>
        Add columns to <link
-       linkend="monitoring-stats-views-table"><structname>pg_stat_replication</structname></link>
+       linkend="pg-stat-replication-view"><structname>pg_stat_replication</structname></link>
        to report replication delay times (Thomas Munro)
       </para>
 

doc/src/sgml/release-9.1.sgml

@@ -9667,7 +9667,7 @@ Branch: REL9_0_STABLE [9d6af7367] 2015-08-15 11:02:34 -0400
       <listitem>
        <para>
         Add system view <link
-        linkend="monitoring-stats-views-table"><structname>pg_stat_replication</structname></link>
+        linkend="pg-stat-replication-view"><structname>pg_stat_replication</structname></link>
         which displays activity of <acronym>WAL</acronym> sender processes (Itagaki
         Takahiro, Simon Riggs)
        </para>

doc/src/sgml/release-9.5.sgml

@@ -6911,7 +6911,7 @@ max_wal_size = (3 * checkpoint_segments) * 16MB
 -->
      <para>
       The <link
-      linkend="monitoring-stats-views-table"><structname>pg_stat_replication</structname></link>
+      linkend="pg-stat-replication-view"><structname>pg_stat_replication</structname></link>
       system view's <structfield>sent</structfield> field is now NULL, not zero, when
       it has no valid value (Magnus Hagander)
      </para>