curl: Update connection timeout default to literal 0 (#5498)

Author: theking2

reference/curl/constants_curl_setopt.xml

@@ -239,7 +239,7 @@
    </term>
    <listitem>
     <para>
-     The number of seconds to wait while trying to connect. Use 0 to
+     The number of seconds to wait while trying to connect. Use <literal>0</literal> to
      wait indefinitely.
      This option accepts any value that can be cast to a valid <type>int</type>.
      Defaults to <literal>300</literal>.