fix misspell in language/functions (#2174)

Author: victor-prdh

language/functions.xml

@@ -494,7 +494,7 @@ Making a bowl of raspberry natural yogurt.
      Argument lists may include the
      <literal>...</literal> token to denote that the function accepts a
      variable number of arguments. The arguments will be passed into the
-     given variable as an array; for example:
+     given variable as an &array; for example:
 
      <example>
       <title>Using <literal>...</literal> to access variable arguments</title>