[PGPRO-6051] [DOC] [ci skip] before release last minute documentation changes

Author: kulaginm

doc/pgprobackup.xml

@@ -977,6 +977,7 @@ GRANT SELECT ON TABLE pg_catalog.pg_namespace TO backup;
 GRANT SELECT ON TABLE pg_catalog.pg_extension TO backup;
 GRANT EXECUTE ON FUNCTION bt_index_check(regclass) TO backup;
 GRANT EXECUTE ON FUNCTION bt_index_check(regclass, bool) TO backup;
+GRANT EXECUTE ON FUNCTION bt_index_check(regclass, bool, bool) TO backup;
 </programlisting>
   </refsect2>
   <refsect2 id="pbk-setting-up-partial-restore">
@@ -4176,7 +4177,7 @@ pg_probackup restore -B <replaceable>backup_dir</replaceable> --instance <replac
 pg_probackup checkdb
 [-B <replaceable>backup_dir</replaceable>] [--instance <replaceable>instance_name</replaceable>] [-D <replaceable>data_dir</replaceable>]
 [--help] [-j <replaceable>num_threads</replaceable>] [--progress]
-[--skip-block-validation] [--amcheck [--checkunique] [--heapallindexed]]
+[--amcheck [--skip-block-validation] [--checkunique] [--heapallindexed]]
 [<replaceable>connection_options</replaceable>] [<replaceable>logging_options</replaceable>]
 </programlisting>
       <para>
@@ -4191,7 +4192,7 @@ pg_probackup checkdb
       <para>
         Performs logical verification of indexes for the specified
         <productname>PostgreSQL</productname> instance if no corruption was found while checking
-        data files. You must have the <application>amcheck</application>
+        data files. You must have the <ulink url="https://postgrespro.com/docs/enterprise/current/amcheck.html"><application>amcheck</application></ulink>
         extension or the <application>amcheck_next</application> extension
         installed in the database to check its indexes. For databases
         without <application>amcheck</application>, index verification will be skipped.
@@ -4211,8 +4212,10 @@ pg_probackup checkdb
         installed in the database.
       </para>
       <para>
-        This verification is only possible if it is supported by the version of the
-        <application>amcheck</application> extension you are using.
+        The verification of unique constraints is only possible if in the version of the
+        <application>amcheck</application> extension you are using, the
+        <function>bt_index_check</function> function takes the
+        <parameter>checkunique</parameter> parameter.
       </para>
       </listitem>
       </varlistentry>
@@ -4226,9 +4229,10 @@ pg_probackup checkdb
         <option>--amcheck</option> flag.
       </para>
       <para>
-        This check is only possible if it is supported by the version of the
-        <application>amcheck</application> extension you are using or
-        if the <application>amcheck_next</application> extension is used instead.
+        This check is only possible if in the version of the
+        <application>amcheck</application>/<application>amcheck_next</application> extension
+        you are using, the <function>bt_index_check</function>
+        function takes the <parameter>heapallindexed</parameter> parameter.
       </para>
       </listitem>
       </varlistentry>