DOC: minor fix

Author: gsmolk

doc/Readme.md

@@ -2,4 +2,4 @@
 ```
 xmllint --noout --valid probackup.xml
 xsltproc stylesheet.xsl probackup.xml >pg-probackup.html
-```
+```

doc/pgprobackup.xml

@@ -1886,7 +1886,7 @@ pg_probackup restore -B <replaceable>backup_dir</replaceable> --instance <replac
       </note>
       <note>
         <para>
-          Due to how recovery works in PostgreSQL < 12 it is advisable to
+          Due to how recovery works in PostgreSQL versions lower than 12 it is advisable to
           disable <option>hot_standby</option> option, when running partial
           restore of PostgreSQL cluster of version less than <option>12</option>.
           Otherwise recovery may fail.