[gl.xml] Fix glMultiDrawArrays() param len expression (#324)

diff --git a/xml/gl.xml b/xml/gl.xml
index 59788b1..1509f4e 100644
--- a/xml/gl.xml
+++ b/xml/gl.xml
@@ -22331,7 +22331,7 @@
         <command>
             <proto>void <name>glMultiDrawArrays</name></proto>
             <param group="PrimitiveType"><ptype>GLenum</ptype> <name>mode</name></param>
-            <param len="COMPSIZE(count)">const <ptype>GLint</ptype> *<name>first</name></param>
+            <param len="COMPSIZE(drawcount)">const <ptype>GLint</ptype> *<name>first</name></param>
             <param len="COMPSIZE(drawcount)">const <ptype>GLsizei</ptype> *<name>count</name></param>
             <param><ptype>GLsizei</ptype> <name>drawcount</name></param>
         </command>