Fix typo in documentation

  <h3>Fulltext Search</h3>

  <p>

    If you want to enable fulltext search, you have to enable this in the database. <br />

    To do this, log into the Mongo database (<span class="code">$ mongo</span>) and run the following command: <span class="code">db.adminCommand({"setParameter": 1, "textSearchEnabled":True})</span>. <br />

    To do this, log into the Mongo database (<span class="code">$ mongo</span>) and run the following command: <span class="code">db.adminCommand({"setParameter": 1, "textSearchEnabled":true})</span>. <br />

    <b>Note:</b> when the Mongo database is shut down, fulltext search will be disabled again. Simply run the same command again to activate it.

  </p>

  <h2>Final notes</h2>