doc: wiki content error

by **feedback.test.account**:

<pre><a href="https://feedback.corp.google.com/#/Report/1026096196">https://feedback.corp.google.com/#/Report/1026096196</a>

Description:
loadPage does not return an error value, nil or non-nil.

The Wiki content is in error.

UI language: en
Detected language: en</pre>
