DOC: fix incorrect merge from PGPRO9_6

Author: Liudmila Mantrova

doc/src/sgml/mchar.sgml

@@ -15,7 +15,7 @@
     It implements types MCHAR and MVARCHAR, which are bug-to-bug
     compatible with MSSQL CHAR and VARCHAR respectively. Additionaly, 
     these types use libicu for comparation and case conversion, so their
-    behavior is identical across different operating system.
+    behavior is identical across different operating systems.
     </para>
     <para>
     &productname; also includes <xref linkend="citext"> extension which

doc/src/sgml/pgpathman.sgml

@@ -84,18 +84,6 @@ CREATE EXTENSION pg_pathman;
       Once <filename>pg_pathman</filename> is enabled, you can start
       partitioning tables.
     </para>
-    <tip>
-      <para>You can also build <filename>pg_pathman</filename> from source code by executing the following command in the <filename>pg_pathman</filename> directory:
-      </para>
-      <programlisting>
-make install USE_PGXS=1
-</programlisting>
-      <para>When this operation is complete, follow the steps described above to complete the setup.
-      </para>
-      <para>In addition, do not forget to set the <envar>PG_CONFIG</envar> variable if you want to test <filename>pg_pathman</filename> on a custom build of <productname>&productname;</productname>. For details, see 
-      <ulink url="https://wiki.postgresql.org/wiki/Building_and_Installing_PostgreSQL_Extension_Modules">Building and Installing PostgreSQL Extension Modules</ulink>.
-      </para>
-    </tip>
       <para>You can toggle <filename>pg_pathman</filename> or its specific custom
         nodes on and off using <acronym>GUC</acronym> variables. For details, see <xref linkend="pg-pathman-guc-variables">.</para>
       <para>

doc/src/sgml/postgres.sgml

@@ -272,8 +272,6 @@
   &contrib;
   &external-projects;
   &config-one-c;
-  &sourcerepo;
-  &docguide;
   &demodb-bookings;
   &acronyms;