doc: Change reloption data type spelling for consistency

Use "floating point" rather than "float4", like everywhere else in
this context.

Author: Shinya11.Kato@nttdata.com
Discussion: https://www.postgresql.org/message-id/flat/TYAPR01MB28965989AF84B57FC351B97BC40F9@TYAPR01MB2896.jpnprd01.prod.outlook.com

doc/src/sgml/ref/create_table.sgml

@@ -1565,7 +1565,7 @@ WITH ( MODULUS <replaceable class="parameter">numeric_literal</replaceable>, REM
    </varlistentry>
 
    <varlistentry id="reloption-autovacuum-vacuum-insert-scale-factor" xreflabel="autovacuum_vacuum_insert_scale_factor">
-    <term><literal>autovacuum_vacuum_insert_scale_factor</literal>, <literal>toast.autovacuum_vacuum_insert_scale_factor</literal> (<type>float4</type>)
+    <term><literal>autovacuum_vacuum_insert_scale_factor</literal>, <literal>toast.autovacuum_vacuum_insert_scale_factor</literal> (<type>floating point</type>)
     <indexterm>
      <primary><varname>autovacuum_vacuum_insert_scale_factor</varname> </primary>
      <secondary>storage parameter</secondary>