Fix typo in database commands documentation.
s/remov/remove/
[<code>--if-exists</code>] <code>remove</code> <var>table record column key</var>...
</p>
<p>
- [<code>--if-exists</code>] <code>remov</code> <var>table record column key</var><code>=</code><var>value</var>...
+ [<code>--if-exists</code>] <code>remove</code> <var>table record column key</var><code>=</code><var>value</var>...
</p>
</dt>
<dd>
