DOC: bug fixes in shardman docs

Author: Liudmila Mantrova

doc/src/sgml/pg_shardman.sgml

@@ -276,15 +276,6 @@
     a transaction confirmation until it is committed on all replicas.
   </para>
 
-      <important>
-        <para>
-         The <varname>shardman.sync_replication</varname> configuration variable should
-         not be changed once the cluster is set up. If you would like to change
-         the selected replication strategy, you have to remove all replicas
-         and reconfigure the replication settings.
-        </para>
-      </important>
-
   <para>
    By default, cluster redundancy level is 0, so replicas are not created.
    You can change the redundancy level as follows:
@@ -799,7 +790,7 @@ SELECT create_hash_partitions('films', 'id', 30, redundancy = 1);
   shards and replicas automatically. There is no easy way to define
   an index on the already sharded table, since the index must be created
   separately for each partition, as described in
-  <ulink url="https://github.com/postgrespro/pg_pathman/wiki/How-do-I-create-indexes"><filename>pg_pathman wiki</filename></ulink>. To execute the same statement on all nodes,
+  <ulink url="https://github.com/postgrespro/pg_pathman/wiki/How-do-I-create-indexes">pg_pathman wiki</ulink>. To execute the same statement on all nodes,
   you can use the <xref linkend="shardman-forall"> function.
 </para>