docs - can set writable_external_table_bufize at session level
<row>
<entry colname="col1">integer 32 - 131072 (32KB - 128MB)</entry>
<entry colname="col2">64</entry>
- <entry colname="col3">local<p>system</p><p>reload</p></entry>
+ <entry colname="col3">local<p>session</p><p>reload</p></entry>
</row>
</tbody>
</tgroup>
