Fix typo in db-timeout help.
<summary>Database query timeout.</summary>
<text>
- <p>Sets the timeout, in seconds, for queries against the database. This includes the <code>pg_start_backup()</code> and <code>pg_stop_backup()</code> functions which can each take a substantial amount of time. Because of this the timeout should be kept high unless you know that these functions will return quickly (i.e. if you have set <setting>startfast=y</setting> and you know that the database cluster will not generate many WAL segments during the backup).</p>
+ <p>Sets the timeout, in seconds, for queries against the database. This includes the <code>pg_start_backup()</code> and <code>pg_stop_backup()</code> functions which can each take a substantial amount of time. Because of this the timeout should be kept high unless you know that these functions will return quickly (i.e. if you have set <setting>start-fast=y</setting> and you know that the database cluster will not generate many WAL segments during the backup).</p>
<admonition type="note">The <br-option>db-timeout</br-option> option must be less than the <br-option>protocol-timeout</br-option> option.</admonition>
</text>
