Fix initilializer value

Author: Girgias

reference/zlib/functions/readgzfile.xml

@@ -10,7 +10,7 @@
   <methodsynopsis>
    <type class="union"><type>int</type><type>false</type></type><methodname>readgzfile</methodname>
    <methodparam><type>string</type><parameter>filename</parameter></methodparam>
-   <methodparam choice="opt"><type>bool</type><parameter>use_include_path</parameter><initializer>0</initializer></methodparam>
+   <methodparam choice="opt"><type>bool</type><parameter>use_include_path</parameter><initializer>&false;</initializer></methodparam>
   </methodsynopsis>
   <para> 
    Reads a file, decompresses it and writes it to standard output.