Not only say that FLOAT is double, but also point to correct data type

h2/src/docsrc/html/faq.html

@@ -269,6 +269,7 @@ is equivalent to <code>DOUBLE</code>, and both are mapped to <code>java.lang.Dou
 See also
 <a href="http://java.sun.com/j2se/1.5.0/docs/guide/jdbc/getstart/mapping.html#1055162">
 Mapping SQL and Java Types - 8.3.10 FLOAT</a>.</p>
+<p>Use REAL or FLOAT(24) data type for <code>java.lang.Float</code> values.</p>
 
 <h3 id="gcj">Is the GCJ Version Stable? Faster?</h3>
 <p>