Revert "refs #41314. In installation-notes.html changed Perl version …

…from 5.24 to 5.20"

This reverts commit a8635b4.

server/resources/installation-notes.html

@@ -31,7 +31,7 @@ <h3>Procedural Languages</h3>
 <p>The procedural languages pl/Perl, pl/Python and pl/Tcl are included in this distribution of PostgreSQL. The server has been built using the LanguagePack community distributions of those language interpreters. To use any of the these languages from within PostgreSQL, download and install the appropriate interpreters and ensure they are included in the PATH variable under which the database server will be started. The versions used are shown below - newer minor (bugfix) releases may also work, but have not been tested:</p>
 
 <ul>
-  <li>Perl 5.20</li>
+  <li>Perl 5.24</li>
   <li>Python 3.4</li>
   <li>Tcl 8.6</li>
 </ul>